CVE-2023-52446 (GCVE-0-2023-52446)

Vulnerability from cvelistv5 – Published: 2024-02-22 16:21 – Updated: 2026-05-11 19:27
VLAI
Title
bpf: Fix a race condition between btf_put() and map_free()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a race condition between btf_put() and map_free() When running `./test_progs -j` in my local vm with latest kernel, I once hit a kasan error like below: [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred [ 1887.190341] Call Trace: [ 1887.190666] <TASK> [ 1887.190949] dump_stack_lvl+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [ 1887.192019] ? panic+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [ 1887.193459] ? __virt_addr_valid+0xac/0x120 [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [ 1887.196736] ? preempt_count_sub+0x1c/0xd0 [ 1887.197270] ? preempt_count_sub+0x1c/0xd0 [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 1887.199943] process_scheduled_works+0x3a2/0x6c0 [ 1887.200549] worker_thread+0x633/0x890 [ 1887.201047] ? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [ 1887.202954] ? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913] </TASK> [ 1887.204913] </TASK> [ 1887.205209] [ 1887.205416] Allocated by task 2197: [ 1887.205881] kasan_set_track+0x3f/0x60 [ 1887.206366] __kasan_kmalloc+0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41/0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Freed by task 36: [ 1887.211460] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_softirq+0x114/0x37e The error happens at bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 <bpf_rb_root_free>: ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9> 34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec && rec->refcount_off >= 0 && 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198> 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8> <==== kasan function 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d <==== use-after-free load 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d> So the problem ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 958cf2e273f0929c66169e0788031310e8118722 , < d048dced8ea5eac6723ae873a40567e6f101ea42 (git)
Affected: 958cf2e273f0929c66169e0788031310e8118722 , < f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306 (git)
Affected: 958cf2e273f0929c66169e0788031310e8118722 , < 59e5791f59dd83e8aa72a4e74217eabb6e8cfd90 (git)
Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n  [ 1887.186498]\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n  [ 1887.190341] Call Trace:\n  [ 1887.190666]  \u003cTASK\u003e\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\n  [ 1887.192449]  print_report+0x14f/0x720\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.194572]  kasan_report+0xc3/0x100\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\n  [ 1887.198883]  array_map_free+0x1a3/0x260\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\n  [ 1887.200549]  worker_thread+0x633/0x890\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\n  [ 1887.201574]  ? kthread+0x102/0x1d0\n  [ 1887.202020]  kthread+0x1ab/0x1d0\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\n  [ 1887.203444]  ret_from_fork+0x34/0x50\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.205209]\n  [ 1887.205416] Allocated by task 2197:\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  [ 1887.210868]\n  [ 1887.211074] Freed by task 36:\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\n  [ 1887.213514]  btf_free+0x5b/0x130\n  [ 1887.213918]  rcu_core+0x638/0xcc0\n  [ 1887.214347]  __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\n  ; {\n    34c0: f3 0f 1e fa                   endbr64\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\n    34c9: 55                            pushq   %rbp\n    34ca: 48 89 e5                      movq    %rsp, %rbp\n  ...\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\n    36aa: 4d 85 ed                      testq   %r13, %r13\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\n                                        \u003c==== kasan function\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\n                                        \u003c==== use-after-free load\n    36bc: 45 85 ff                      testl   %r15d, %r15d\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\n\nSo the problem \n---truncated---"
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        "dateUpdated": "2026-05-11T19:27:29.463Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"
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      "title": "bpf: Fix a race condition between btf_put() and map_free()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52446",
    "datePublished": "2024-02-22T16:21:38.408Z",
    "dateReserved": "2024-02-20T12:30:33.291Z",
    "dateUpdated": "2026-05-11T19:27:29.463Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2023-52446",
      "date": "2026-07-14",
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix a race condition between btf_put() and map_free()\\n\\nWhen running `./test_progs -j` in my local vm with latest kernel,\\nI once hit a kasan error like below:\\n\\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\\n  [ 1887.186498]\\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\\n  [ 1887.190341] Call Trace:\\n  [ 1887.190666]  \u003cTASK\u003e\\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\\n  [ 1887.192449]  print_report+0x14f/0x720\\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.194572]  kasan_report+0xc3/0x100\\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\\n  [ 1887.198883]  array_map_free+0x1a3/0x260\\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\\n  [ 1887.200549]  worker_thread+0x633/0x890\\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\\n  [ 1887.201574]  ? kthread+0x102/0x1d0\\n  [ 1887.202020]  kthread+0x1ab/0x1d0\\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.203444]  ret_from_fork+0x34/0x50\\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.205209]\\n  [ 1887.205416] Allocated by task 2197:\\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  [ 1887.210868]\\n  [ 1887.211074] Freed by task 36:\\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\\n  [ 1887.213514]  btf_free+0x5b/0x130\\n  [ 1887.213918]  rcu_core+0x638/0xcc0\\n  [ 1887.214347]  __do_softirq+0x114/0x37e\\n\\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\\n\\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\\n  ; {\\n    34c0: f3 0f 1e fa                   endbr64\\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\\n    34c9: 55                            pushq   %rbp\\n    34ca: 48 89 e5                      movq    %rsp, %rbp\\n  ...\\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\\n    36aa: 4d 85 ed                      testq   %r13, %r13\\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\\n                                        \u003c==== kasan function\\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\\n                                        \u003c==== use-after-free load\\n    36bc: 45 85 ff                      testl   %r15d, %r15d\\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\\n\\nSo the problem \\n---truncated---\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: bpf: corrige una condici\\u00f3n de ejecuci\\u00f3n entre btf_put() y map_free() Al ejecutar `./test_progs -j` en mi m\\u00e1quina virtual local con el \\u00faltimo kernel, una vez encontr\\u00e9 un error kasan como a continuaci\\u00f3n: [ 1887.184724] ERROR: KASAN: slab-use-after-free en bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Lectura del tama\\u00f1o 4 en la direcci\\u00f3n ffff888106806910 por tarea kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Contaminado: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [1887.188034] Nombre de hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0 -0-g155821a1990b-prebuilt.qemu.org 01/04/2014 [1887.189618] Cola de trabajo: events_unbound bpf_map_free_deferred [1887.190341] Seguimiento de llamadas: [1887.190666]  [1887.190949] dump_stack_lv l+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [1887.192019]? p\\u00e1nico+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [1887.193459]? __virt_addr_valid+0xac/0x120 [1887.194004]? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [1887.196736]? preempt_count_sub+0x1c/0xd0 [1887.197270]? preempt_count_sub+0x1c/0xd0 [1887.197802]? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 18 87.199943] Process_scheduled_works+0x3a2/0x6c0 [1887.200549] trabajador_thread+0x633/0x890 [1887.201047]? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [1887.202954]? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913]  [ 1887.204913]  [ 1887.205209] [ 1887.205416] Asignado por tarea 2197: [1887.205881] kasan_set_track+0x3f/0x60 [1887.206366] __kasan_kmalloc +0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387 ] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41 /0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] Entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Liberado por la tarea 36: [ 1887.21146 0] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+ 0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_ softirq+0x114/0x37e El error ocurre en bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 : ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9  34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec \u0026amp;\u0026amp; rec-\u0026gt;refcount_off \u0026gt;= 0 \u0026amp;\u0026amp; 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658  36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3 : e8 00 00 00 00 callq 0x36b8  \u0026lt;==== funci\\u00f3n kasan 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d \u0026lt;==== carga de uso despu\\u00e9s de liberaci\\u00f3n 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d  Entonces el problema ---truncado---\"}]",
      "id": "CVE-2023-52446",
      "lastModified": "2024-11-21T08:39:46.940",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-02-22T17:15:08.527",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52446\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-22T17:15:08.527\",\"lastModified\":\"2026-06-17T06:42:42.877\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix a race condition between btf_put() and map_free()\\n\\nWhen running `./test_progs -j` in my local vm with latest kernel,\\nI once hit a kasan error like below:\\n\\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\\n  [ 1887.186498]\\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\\n  [ 1887.190341] Call Trace:\\n  [ 1887.190666]  \u003cTASK\u003e\\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\\n  [ 1887.192449]  print_report+0x14f/0x720\\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.194572]  kasan_report+0xc3/0x100\\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\\n  [ 1887.198883]  array_map_free+0x1a3/0x260\\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\\n  [ 1887.200549]  worker_thread+0x633/0x890\\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\\n  [ 1887.201574]  ? kthread+0x102/0x1d0\\n  [ 1887.202020]  kthread+0x1ab/0x1d0\\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.203444]  ret_from_fork+0x34/0x50\\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.205209]\\n  [ 1887.205416] Allocated by task 2197:\\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  [ 1887.210868]\\n  [ 1887.211074] Freed by task 36:\\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\\n  [ 1887.213514]  btf_free+0x5b/0x130\\n  [ 1887.213918]  rcu_core+0x638/0xcc0\\n  [ 1887.214347]  __do_softirq+0x114/0x37e\\n\\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\\n\\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\\n  ; {\\n    34c0: f3 0f 1e fa                   endbr64\\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\\n    34c9: 55                            pushq   %rbp\\n    34ca: 48 89 e5                      movq    %rsp, %rbp\\n  ...\\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\\n    36aa: 4d 85 ed                      testq   %r13, %r13\\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\\n                                        \u003c==== kasan function\\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\\n                                        \u003c==== use-after-free load\\n    36bc: 45 85 ff                      testl   %r15d, %r15d\\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\\n\\nSo the problem \\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige una condici\u00f3n de ejecuci\u00f3n entre btf_put() y map_free() Al ejecutar `./test_progs -j` en mi m\u00e1quina virtual local con el \u00faltimo kernel, una vez encontr\u00e9 un error kasan como a continuaci\u00f3n: [ 1887.184724] ERROR: KASAN: slab-use-after-free en bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Lectura del tama\u00f1o 4 en la direcci\u00f3n ffff888106806910 por tarea kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Contaminado: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [1887.188034] Nombre de hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0 -0-g155821a1990b-prebuilt.qemu.org 01/04/2014 [1887.189618] Cola de trabajo: events_unbound bpf_map_free_deferred [1887.190341] Seguimiento de llamadas: [1887.190666]  [1887.190949] dump_stack_lv l+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [1887.192019]? p\u00e1nico+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [1887.193459]? __virt_addr_valid+0xac/0x120 [1887.194004]? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [1887.196736]? preempt_count_sub+0x1c/0xd0 [1887.197270]? preempt_count_sub+0x1c/0xd0 [1887.197802]? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 18 87.199943] Process_scheduled_works+0x3a2/0x6c0 [1887.200549] trabajador_thread+0x633/0x890 [1887.201047]? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [1887.202954]? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913]  [ 1887.204913]  [ 1887.205209] [ 1887.205416] Asignado por tarea 2197: [1887.205881] kasan_set_track+0x3f/0x60 [1887.206366] __kasan_kmalloc +0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387 ] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41 /0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] Entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Liberado por la tarea 36: [ 1887.21146 0] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+ 0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_ softirq+0x114/0x37e El error ocurre en bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 : ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9  34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec \u0026amp;\u0026amp; rec-\u0026gt;refcount_off \u0026gt;= 0 \u0026amp;\u0026amp; 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658  36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3 : e8 00 00 00 00 callq 0x36b8  \u0026lt;==== funci\u00f3n kasan 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d \u0026lt;==== carga de uso despu\u00e9s de liberaci\u00f3n 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d  Entonces el problema ---truncado---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/syscall.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"958cf2e273f0929c66169e0788031310e8118722\",\"lessThan\":\"d048dced8ea5eac6723ae873a40567e6f101ea42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"958cf2e273f0929c66169e0788031310e8118722\",\"lessThan\":\"f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"958cf2e273f0929c66169e0788031310e8118722\",\"lessThan\":\"59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/syscall.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.14\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.2\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-30T19:48:46.097566Z\",\"id\":\"CVE-2023-52446\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2.0\",\"versionEndExcluding\":\"6.6.14\",\"matchCriteriaId\":\"BDBBEB0E-D13A-4567-8984-51C5375350B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.0\",\"versionEndExcluding\":\"6.7.2\",\"matchCriteriaId\":\"0EA3778C-730B-464C-8023-18CA6AC0B807\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:25:49+00:00",
      "cve": "CVE-2023-52446",
      "id": "CVE-2023-52446",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix a race condition between btf_put() and map_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52446.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T22:55:41.647Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52446\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-30T19:48:46.097566Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-24T20:38:09.591Z\"}}], \"cna\": {\"title\": \"bpf: Fix a race condition between btf_put() and map_free()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"958cf2e273f0929c66169e0788031310e8118722\", \"lessThan\": \"d048dced8ea5eac6723ae873a40567e6f101ea42\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"958cf2e273f0929c66169e0788031310e8118722\", \"lessThan\": \"f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"958cf2e273f0929c66169e0788031310e8118722\", \"lessThan\": \"59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/syscall.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/syscall.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42\"}, {\"url\": \"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306\"}, {\"url\": \"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix a race condition between btf_put() and map_free()\\n\\nWhen running `./test_progs -j` in my local vm with latest kernel,\\nI once hit a kasan error like below:\\n\\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\\n  [ 1887.186498]\\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\\n  [ 1887.190341] Call Trace:\\n  [ 1887.190666]  \u003cTASK\u003e\\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\\n  [ 1887.192449]  print_report+0x14f/0x720\\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.194572]  kasan_report+0xc3/0x100\\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\\n  [ 1887.198883]  array_map_free+0x1a3/0x260\\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\\n  [ 1887.200549]  worker_thread+0x633/0x890\\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\\n  [ 1887.201574]  ? kthread+0x102/0x1d0\\n  [ 1887.202020]  kthread+0x1ab/0x1d0\\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.203444]  ret_from_fork+0x34/0x50\\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.204913]  \u003c/TASK\u003e\\n  [ 1887.205209]\\n  [ 1887.205416] Allocated by task 2197:\\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  [ 1887.210868]\\n  [ 1887.211074] Freed by task 36:\\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\\n  [ 1887.213514]  btf_free+0x5b/0x130\\n  [ 1887.213918]  rcu_core+0x638/0xcc0\\n  [ 1887.214347]  __do_softirq+0x114/0x37e\\n\\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\\n\\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\\n  ; {\\n    34c0: f3 0f 1e fa                   endbr64\\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\\n    34c9: 55                            pushq   %rbp\\n    34ca: 48 89 e5                      movq    %rsp, %rbp\\n  ...\\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\\n    36aa: 4d 85 ed                      testq   %r13, %r13\\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\\n                                        \u003c==== kasan function\\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\\n                                        \u003c==== use-after-free load\\n    36bc: 45 85 ff                      testl   %r15d, %r15d\\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\\n\\nSo the problem \\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:36:42.890Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52446\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:36:42.890Z\", \"dateReserved\": \"2024-02-20T12:30:33.291Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-22T16:21:38.408Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.