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            "net/bluetooth/mgmt_util.h"
          ],
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          "vendor": "Linux",
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            {
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              "lessThanOrEqual": "*",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix possible UAFs\n\nThis attemps to fix possible UAFs caused by struct mgmt_pending being\nfreed while still being processed like in the following trace, in order\nto fix mgmt_pending_valid is introduce and use to check if the\nmgmt_pending hasn\u0027t been removed from the pending list, on the complete\ncallbacks it is used to check and in addtion remove the cmd from the list\nwhile holding mgmt_pending_lock to avoid TOCTOU problems since if the cmd\nis left on the list it can still be accessed and freed.\n\nBUG: KASAN: slab-use-after-free in mgmt_add_adv_patterns_monitor_sync+0x35/0x50 net/bluetooth/mgmt.c:5223\nRead of size 8 at addr ffff8880709d4dc0 by task kworker/u11:0/55\n\nCPU: 0 UID: 0 PID: 55 Comm: kworker/u11:0 Not tainted 6.16.4 #2 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n mgmt_add_adv_patterns_monitor_sync+0x35/0x50 net/bluetooth/mgmt.c:5223\n hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x711/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16.4/arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 12210:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4364\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n mgmt_pending_new+0x65/0x1e0 net/bluetooth/mgmt_util.c:269\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n __add_adv_patterns_monitor+0x130/0x200 net/bluetooth/mgmt.c:5247\n add_adv_patterns_monitor+0x214/0x360 net/bluetooth/mgmt.c:5364\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:714 [inline]\n __sock_sendmsg+0x219/0x270 net/socket.c:729\n sock_write_iter+0x258/0x330 net/socket.c:1133\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x5c9/0xb30 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 12221:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2381 [inline]\n slab_free mm/slub.c:4648 [inline]\n kfree+0x18e/0x440 mm/slub.c:4847\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n __mgmt_power_off+0x169/0x350 net/bluetooth/mgmt.c:9444\n hci_dev_close_sync+0x754/0x1330 net/bluetooth/hci_sync.c:5290\n hci_dev_do_close net/bluetooth/hci_core.c:501 [inline]\n hci_dev_close+0x108/0x200 net/bluetooth/hci_core.c:526\n sock_do_ioctl+0xd9/0x300 net/socket.c:1192\n sock_ioctl+0x576/0x790 net/socket.c:1313\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xf\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:L - Both sides of the race are local syscalls \u2014 `write()` of an MGMT command on an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and `ioctl(HCIDEVDOWN)` \u2014 with no over-the-air component; a remote or adjacent Bluetooth peer cannot inject MGMT commands.\nAC:L - The attacker owns both sides of the race, spawning one thread that queues mgmt commands (widening the window via the hci_cmd_sync workqueue dispatch latency) and another that closes the device, and can retry in a tight loop until the free lands inside the worker\u0027s dereference.\nPR:L - Reaching the affected opcodes requires HCI_SOCK_TRUSTED, granted by CAP_NET_ADMIN, which is a delegable capability commonly held by non-root service accounts (bluetoothd, Android\u0027s Bluetooth process) rather than full init-namespace root \u2014 so compromising that already-network-exposed daemon yields this primitive.\nUI:N - The attacker performs every step itself \u2014 queueing the mgmt command and tearing the HCI device down \u2014 with no victim action required.\nS:U - The corruption stays within the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed cmd\u0027s `user_data` is dereferenced as an `adv_monitor`, so a heap-sprayed replacement lets msft_add_monitor_pattern() walk an attacker-supplied pattern list and read arbitrary kernel memory back through the mgmt event socket, and `cmd-\u003esk`/`cmd-\u003eparam` reads leak further kernel data.\nI:H - `monitor-\u003ehandle = handle` after `idr_alloc()` writes a controlled value at an attacker-chosen address, and the stale `list_del` in mgmt_pending_remove(), dangling `kfree_skb(cmd-\u003eskb)`, and spurious `sock_put(cmd-\u003esk)` add double-free and refcount-underflow primitives sufficient for control-flow hijack.\nA:H - Even unweaponized, dereferencing the freed mgmt_pending_cmd oopses the kernel \u2014 as reproduced by the KASAN slab-use-after-free in mgmt_add_adv_patterns_monitor_sync \u2014 and can be triggered repeatedly."
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:49.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/0b60eb04b8524e1b4b3f07fea0d16fda9a677d9a"
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        {
          "url": "https://git.kernel.org/stable/c/d71b98f253b079cbadc83266383f26fe7e9e103b"
        },
        {
          "url": "https://git.kernel.org/stable/c/87a1f16f07c6c43771754075e08f45b41d237421"
        },
        {
          "url": "https://git.kernel.org/stable/c/302a1f674c00dd5581ab8e493ef44767c5101aab"
        }
      ],
      "title": "Bluetooth: MGMT: Fix possible UAFs",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39981",
    "datePublished": "2025-10-15T07:56:00.959Z",
    "dateReserved": "2025-04-16T07:20:57.150Z",
    "dateUpdated": "2026-08-05T12:06:49.384Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

{
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          "product": "Linux",
          "programFiles": [
            "security/integrity/ima/ima_appraise.c"
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            "security/integrity/ima/ima_appraise.c"
          ],
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              "version": "5.14"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr\n\nCurrently when both IMA and EVM are in fix mode, the IMA signature will\nbe reset to IMA hash if a program first stores IMA signature in\nsecurity.ima and then writes/removes some other security xattr for the\nfile.\n\nFor example, on Fedora, after booting the kernel with \"ima_appraise=fix\nevm=fix ima_policy=appraise_tcb\" and installing rpm-plugin-ima,\ninstalling/reinstalling a package will not make good reference IMA\nsignature generated. Instead IMA hash is generated,\n\n    # getfattr -m - -d -e hex /usr/bin/bash\n    # file: usr/bin/bash\n    security.ima=0x0404...\n\nThis happens because when setting security.selinux, the IMA_DIGSIG flag\nthat had been set early was cleared. As a result, IMA hash is generated\nwhen the file is closed.\n\nSimilarly, IMA signature can be cleared on file close after removing\nsecurity xattr like security.evm or setting/removing ACL.\n\nPrevent replacing the IMA file signature with a file hash, by preventing\nthe IMA_DIGSIG flag from being reset.\n\nHere\u0027s a minimal C reproducer which sets security.selinux as the last\nstep which can also replaced by removing security.evm or setting ACL,\n\n    #include \u003cstdio.h\u003e\n    #include \u003csys/xattr.h\u003e\n    #include \u003cfcntl.h\u003e\n    #include \u003cunistd.h\u003e\n    #include \u003cstring.h\u003e\n    #include \u003cstdlib.h\u003e\n\n    int main() {\n        const char* file_path = \"/usr/sbin/test_binary\";\n        const char* hex_string = \"030204d33204490066306402304\";\n        int length = strlen(hex_string);\n        char* ima_attr_value;\n        int fd;\n\n        fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644);\n        if (fd == -1) {\n            perror(\"Error opening file\");\n            return 1;\n        }\n\n        ima_attr_value = (char*)malloc(length / 2 );\n        for (int i = 0, j = 0; i \u003c length; i += 2, j++) {\n            sscanf(hex_string + i, \"%2hhx\", \u0026ima_attr_value[j]);\n        }\n\n        if (fsetxattr(fd, \"security.ima\", ima_attr_value, length/2, 0) == -1) {\n            perror(\"Error setting extended attribute\");\n            close(fd);\n            return 1;\n        }\n\n        const char* selinux_value= \"system_u:object_r:bin_t:s0\";\n        if (fsetxattr(fd, \"security.selinux\", selinux_value, strlen(selinux_value), 0) == -1) {\n            perror(\"Error setting extended attribute\");\n            close(fd);\n            return 1;\n        }\n\n        close(fd);\n\n        return 0;\n    }"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Triggering requires local syscalls against a file on the system \u2014 `setxattr`/`fsetxattr` on an EVM-protected xattr, `setfacl`, or `fremovexattr` \u2014 followed by an open/close of the target file. No network, adjacent-network, or physical path reaches the IMA appraisal hooks.\nAC:L - The commit ships a deterministic reproducer: setting any EVM-protected xattr or a POSIX ACL unconditionally clears IMA_DIGSIG every time, with no memory-layout or timing luck involved. The enforce-mode variant needs a race against `process_measurement()`\u0027s `MAY_WRITE` check, but `ima_reset_appraise_flags()` takes no `iint-\u003emutex`, and the attacker drives both sides (one thread spinning on `setxattr(\"system.posix_acl_access\")`, another on `open(O_WRONLY)`); the required IMA-appraise + EVM configuration is a shipped, supported Fedora/RHEL setup, not a rare build option.\nPR:L - `vfs_set_acl()` invokes `security_inode_set_acl()` \u2192 `ima_inode_set_acl()` \u2192 `ima_reset_appraise_flags(inode, 0)` before `set_posix_acl()` ever reaches its `inode_owner_or_capable()` check, so an unprivileged user with no capabilities and no ownership of the file clears the cached IMA_DIGSIG bit on any signed appraised binary \u2014 the syscall fails with -EPERM only after the flag is already gone. No CAP_SYS_ADMIN is needed for this path, unlike the `security.ima` path guarded by `ima_protect_xattr()`.\nUI:N - The attacker performs the xattr/ACL operation and the file open/close entirely from their own process; no victim must mount a filesystem, open a file, or take any other action for the IMA_DIGSIG flag to be cleared and the signature to be replaced.\nS:U - The defeated control (IMA appraisal) and the affected resources (files and their security xattrs) live in the same kernel security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Clearing IMA_DIGSIG both drops the \"signed files cannot be opened for write\" enforcement at `ima_main.c:472` and lets `ima_update_xattr()` re-bless the modified content with a fresh hash plus EVM HMAC, so attacker-substituted content in an appraised executable passes appraisal and subsequently runs \u2014 typically in a privileged/service context \u2014 yielding full disclosure of data reachable by that code. This is the standard treatment of a code-integrity/signature-verification bypass; the bug itself contains no direct memory-read primitive.\nI:H - The file\u0027s IMA digital signature \u2014 the one integrity artifact a local attacker cannot forge, since it is verified against the trusted IMA keyring \u2014 is silently destroyed and replaced by a locally computed hash written through `__vfs_setxattr_noperm()`, which bypasses the `CAP_SYS_ADMIN` gate in `ima_protect_xattr()`. Combined with the lost write-block, this converts \"signed and immutable\" into \"mutable and re-blessed on close\", a complete integrity bypass of IMA appraisal for the affected file.\nA:H - Once a signature is replaced by a plain hash, any policy carrying IMA_DIGSIG_REQUIRED (`appraise_type=imasig`) rejects that file in enforce mode, so appraised binaries become permanently unexecutable \u2014 applied to system-critical files such as init, sshd, or libc consumers this denies service and can leave the system unbootable, and the corrupted xattr persists on disk until the file is re-signed out of band."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:06.378Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d2993a7e98eb70c737c6f5365a190e79c72b8407"
        },
        {
          "url": "https://git.kernel.org/stable/c/edd824eb45e4f7e05ad3ab090dab6dbdb79cd292"
        },
        {
          "url": "https://git.kernel.org/stable/c/02aa671c08a4834bef5166743a7b88686fbfa023"
        },
        {
          "url": "https://git.kernel.org/stable/c/88b4cbcf6b041ae0f2fc8a34554a5b6a83a2b7cd"
        }
      ],
      "title": "ima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: act_csum: validate nested VLAN headers\n\ntcf_csum_act() walks nested VLAN headers directly from skb-\u003edata when an\nskb still carries in-payload VLAN tags. The current code reads\nvlan-\u003eh_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without\nfirst ensuring that the full VLAN header is present in the linear area.\n\nIf only part of an inner VLAN header is linearized, accessing\nh_vlan_encapsulated_proto reads past the linear area, and the following\nskb_pull(VLAN_HLEN) may violate skb invariants.\n\nFix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and\npulling each nested VLAN header. If the header still is not fully\navailable, drop the packet through the existing error path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:13:24.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725"
        },
        {
          "url": "https://git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513"
        },
        {
          "url": "https://git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834"
        }
      ],
      "title": "net: sched: act_csum: validate nested VLAN headers",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31684",
    "datePublished": "2026-04-25T08:47:01.555Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-06-01T16:13:24.352Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}