Vulnerability-Lookup

ALSA-2026:74438

Vulnerability from osv_almalinux – Published: 2026-10-01 00:00 – Updated: 2026-10-06 10:29 – Source website

Summary

Moderate: kernel security, bug fix, and enhancement update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send (CVE-2026-45856)
kernel: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path (CVE-2026-63794)
kernel: futex: Fix race on the initial mm->futex.phash.ref allocation (CVE-2026-80775)

Bug Fix(es) and Enhancement(s):

Backport of protocol attribute to IP addresses (IFA_PROTO) [almalinux-9.8.z] (JIRA:AlmaLinux-169936)
try_charge_memcg() refactor in kernel 5.14.0-687.36.1 causes premature memcg OOM with GiB of clean page cache present [almalinux-9.8.z] (JIRA:AlmaLinux-269060)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:74438	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-45856	REPORT
	https://access.redhat.com/security/cve/CVE-2026-63794	REPORT
	https://access.redhat.com/security/cve/CVE-2026-80775	REPORT
	https://bugzilla.redhat.com/2482129	REPORT
	https://bugzilla.redhat.com/2502241	REPORT
	https://bugzilla.redhat.com/2528550	REPORT
	https://errata.almalinux.org/9/ALSA-2026-74438.html	ADVISORY

JSON

To clipboard

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  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send (CVE-2026-45856)\n  * kernel: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path (CVE-2026-63794)\n  * kernel: futex: Fix race on the initial mm-\u003efutex.phash.ref allocation (CVE-2026-80775)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * Backport of protocol attribute to IP addresses (IFA_PROTO) [almalinux-9.8.z] (JIRA:AlmaLinux-169936)\n  * try_charge_memcg() refactor in kernel 5.14.0-687.36.1 causes premature memcg OOM with GiB of clean page cache present [almalinux-9.8.z] (JIRA:AlmaLinux-269060)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:74438",
  "modified": "2026-10-06T10:29:11Z",
  "published": "2026-10-01T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:74438"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-45856"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-63794"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-80775"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2482129"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2502241"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2528550"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-74438.html"
    }
  ],
  "related": [
    "CVE-2026-45856",
    "CVE-2026-63794",
    "CVE-2026-80775"
  ],
  "summary": "Moderate: kernel security, bug fix, and enhancement update"
}

CVE-2026-45856 (GCVE-0-2026-45856)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-08-05 12:28

Title

RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send ib_uverbs_post_send() uses cmd.wqe_size from userspace without any validation before passing it to kmalloc() and using the allocated buffer as struct ib_uverbs_send_wr. If a user provides a small wqe_size value (e.g., 1), kmalloc() will succeed, but subsequent accesses to user_wr->opcode, user_wr->num_sge, and other fields will read beyond the allocated buffer, resulting in an out-of-bounds read from kernel heap memory. This could potentially leak sensitive kernel information to userspace. Additionally, providing an excessively large wqe_size can trigger a WARNING in the memory allocation path, as reported by syzkaller. This is inconsistent with ib_uverbs_unmarshall_recv() which properly validates that wqe_size >= sizeof(struct ib_uverbs_recv_wr) before proceeding. Add the same validation for ib_uverbs_post_send() to ensure wqe_size is at least sizeof(struct ib_uverbs_send_wr).

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/9c15ec4cd4e7f57c6…
https://git.kernel.org/stable/c/9b5ac1c15334d46c0…
https://git.kernel.org/stable/c/01c9b152647dc70dc…
https://git.kernel.org/stable/c/bf1feed1a7886af94…
https://git.kernel.org/stable/c/d533425ac1f2925b4…
https://git.kernel.org/stable/c/bf4454da8b1e71271…
https://git.kernel.org/stable/c/bef70ff9841990658…
https://git.kernel.org/stable/c/1956f0a74ccf5dc9c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c3bea3d2dc5358e05541527283279102383b0231 , < 9c15ec4cd4e7f57c6bbcb4e73e99290f150dd2a7 (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < 9b5ac1c15334d46c0dbd49d64a2257b929500163 (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < 01c9b152647dc70dc06a4a2eff86ebb3b3c76075 (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < bf1feed1a7886af945f92890493aefd2b5c9928a (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < d533425ac1f2925b4fc3e4ed9b9d72362cb23475 (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < bf4454da8b1e712714628c0a0d6e7845bb40790a (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < bef70ff9841990658610512b4a18e4a88c9b4df6 (git) Affected: c3bea3d2dc5358e05541527283279102383b0231 , < 1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0 (git)
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45856",
    "datePublished": "2026-05-27T12:15:33.209Z",
    "dateReserved": "2026-05-13T15:03:33.079Z",
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}

CVE-2026-63794 (GCVE-0-2026-63794)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:50

Title

KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path In sev_dbg_crypt(), the per-iteration transfer length is bounded by the source page offset (PAGE_SIZE - s_off) but not by the destination page offset (PAGE_SIZE - d_off). When d_off > s_off, the encrypt path (__sev_dbg_encrypt_user) performs a read-modify-write using a single-page intermediate buffer (dst_tpage): 1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off & 15), 16) before issuing the PSP command. If len + (d_off & 15) > PAGE_SIZE, the PSP writes beyond the end of the 4096-byte dst_tpage allocation. 2. The subsequent memcpy()/copy_from_user() into page_address(dst_tpage) + (d_off & 15) of 'len' bytes overflows by up to 15 bytes under the same condition. Trigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE - the PSP is instructed to write round_up(4097, 16) = 4112 bytes to a 4096-byte buffer. Fix by also bounding len by (PAGE_SIZE - d_off), the same check that sev_send_update_data() already performs for its single-page guest region. ================================================================== BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd] Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214 CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G U W 7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY Tainted: [U]=USER, [W]=WARN Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025 Call Trace: <TASK> dump_stack_lvl+0x54/0x70 print_report+0xbc/0x260 kasan_report+0xa2/0xd0 kasan_check_range+0x25f/0x2c0 __asan_memcpy+0x40/0x70 sev_dbg_crypt+0x993/0xd10 [kvm_amd] sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd] kvm_vm_ioctl+0x65d/0x6d0 [kvm] __se_sys_ioctl+0xb2/0x100 do_syscall_64+0xe8/0x870 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb memcg:ff11000112827d82 flags: 0x1400000000000000(node=1|zone=1) raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82 page dumped because: kasan: bad access detected Memory state around the buggy address: ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint [sean: add sample KASAN splat, Fixes, and stable@]

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/f701ae476cb92a3a3…
https://git.kernel.org/stable/c/64f2449841ffc7d20…
https://git.kernel.org/stable/c/9349b50f4b11f135f…
https://git.kernel.org/stable/c/889c2a9c59897ca91…
https://git.kernel.org/stable/c/e1a0fe288dee07b7d…
https://git.kernel.org/stable/c/720949ed666f34ff2…
https://git.kernel.org/stable/c/2753a097d1fe24c43…
https://git.kernel.org/stable/c/78ee2d50185a037b3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < f701ae476cb92a3a3d8844bb39bb63b4512684c8 (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 64f2449841ffc7d203183aa4c748c9c77951ecc5 (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 9349b50f4b11f135fe73b56cb2c2c872d8bc71d7 (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 889c2a9c59897ca912bf39df5bb92555a0a13df4 (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < e1a0fe288dee07b7da25a71e007c1ecd1080315b (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 720949ed666f34ff28ffdfe1471a5861d1e41fdf (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 2753a097d1fe24c4351c608048612c74108aa89f (git) Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 78ee2d50185a037b3d2452a97f3dad69c3f7f389 (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 5.10.260 , ≤ 5.10.* (semver) Unaffected: 5.15.211 , ≤ 5.15.* (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.1.3 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
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              "version": "0",
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              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.95",
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              "lessThanOrEqual": "6.18.*",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path\n\nIn sev_dbg_crypt(), the per-iteration transfer length is bounded by\nthe source page offset (PAGE_SIZE - s_off) but not by the destination\npage offset (PAGE_SIZE - d_off).  When d_off \u003e s_off, the encrypt\npath (__sev_dbg_encrypt_user) performs a read-modify-write using a\nsingle-page intermediate buffer (dst_tpage):\n\n  1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off \u0026 15), 16)\n     before issuing the PSP command.  If len + (d_off \u0026 15) \u003e PAGE_SIZE,\n     the PSP writes beyond the end of the 4096-byte dst_tpage allocation.\n\n  2. The subsequent memcpy()/copy_from_user() into\n     page_address(dst_tpage) + (d_off \u0026 15) of \u0027len\u0027 bytes overflows\n     by up to 15 bytes under the same condition.\n\nTrigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -\nthe PSP is instructed to write round_up(4097, 16) = 4112 bytes to\na 4096-byte buffer.\n\nFix by also bounding len by (PAGE_SIZE - d_off), the same check that\nsev_send_update_data() already performs for its single-page guest\nregion.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214\n\n CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G     U  W           7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY\n Tainted: [U]=USER, [W]=WARN\n Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x54/0x70\n  print_report+0xbc/0x260\n  kasan_report+0xa2/0xd0\n  kasan_check_range+0x25f/0x2c0\n  __asan_memcpy+0x40/0x70\n  sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n  sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]\n  kvm_vm_ioctl+0x65d/0x6d0 [kvm]\n  __se_sys_ioctl+0xb2/0x100\n  do_syscall_64+0xe8/0x870\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  \u003c/TASK\u003e\n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb\n memcg:ff11000112827d82\n flags: 0x1400000000000000(node=1|zone=1)\n raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000\n raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n \u003eff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n                    ^\n  ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n  ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ==================================================================\n Disabling lock debugging due to kernel taint\n\n[sean: add sample KASAN splat, Fixes, and stable@]"
        }
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        "dateUpdated": "2026-08-17T04:50:58.924Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f701ae476cb92a3a3d8844bb39bb63b4512684c8"
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          "url": "https://git.kernel.org/stable/c/64f2449841ffc7d203183aa4c748c9c77951ecc5"
        },
        {
          "url": "https://git.kernel.org/stable/c/9349b50f4b11f135fe73b56cb2c2c872d8bc71d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/889c2a9c59897ca912bf39df5bb92555a0a13df4"
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          "url": "https://git.kernel.org/stable/c/e1a0fe288dee07b7da25a71e007c1ecd1080315b"
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          "url": "https://git.kernel.org/stable/c/720949ed666f34ff28ffdfe1471a5861d1e41fdf"
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          "url": "https://git.kernel.org/stable/c/2753a097d1fe24c4351c608048612c74108aa89f"
        },
        {
          "url": "https://git.kernel.org/stable/c/78ee2d50185a037b3d2452a97f3dad69c3f7f389"
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      "title": "KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63794",
    "datePublished": "2026-07-19T12:02:03.488Z",
    "dateReserved": "2026-07-19T07:54:57.012Z",
    "dateUpdated": "2026-08-17T04:50:58.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-80775 (GCVE-0-2026-80775)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12

Title

futex: Fix race on the initial mm->futex.phash.ref allocation

Summary

In the Linux kernel, the following vulnerability has been resolved: futex: Fix race on the initial mm->futex.phash.ref allocation futex_hash_allocate() allocates mm->futex.phash.ref without any locking. Commit d9b05321e21e ("futex: Move futex_hash_free() back to __mmput()") moved the allocation here and assumed that the process has just a single thread at this point. Commit ee9dce44362b ("futex: Drop CLONE_THREAD requirement for private default hash alloc") widened need_futex_hash_allocate_default() to cover any CLONE_VM clone, but left out vfork because the parent is suspended and cannot race. That no longer holds once vfork is nested. If a vfork child calls vfork again and is then killed with SIGKILL, the parent is released from its vfork wait and runs concurrently with the grandchild in the same mm. Neither of them went through futex_hash_allocate_default(). When both call prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS) at the same time, each one sees mm->futex.phash.ref as NULL and stores its own percpu counter. Only the last store survives. The counter stored first is no longer reachable from the mm, so the references on it are not seen by __futex_ref_atomic_end(). A private hash that still has references is then considered dead and freed, and a task that still holds one of its buckets writes into freed memory in futex_q_lock(). Store the counter once with cmpxchg() and let the loser free_percpu() its own. The initial reference has to be taken before the store, otherwise another task can install a private hash while the counter is still 0.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/86d12b34bafc9a4c2…
https://git.kernel.org/stable/c/ff252ed45c8263525…
https://git.kernel.org/stable/c/c4b4972d8edcdf50b…
https://git.kernel.org/stable/c/bde0238083647381d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d9b05321e21e4b218de4ce8a590bf375f58b6346 , < 86d12b34bafc9a4c271a9edefea88855a934d6e5 (git) Affected: d9b05321e21e4b218de4ce8a590bf375f58b6346 , < ff252ed45c8263525f2f54d81c5fa6d547fba344 (git) Affected: d9b05321e21e4b218de4ce8a590bf375f58b6346 , < c4b4972d8edcdf50b6518f55119e129d2f668a10 (git) Affected: d9b05321e21e4b218de4ce8a590bf375f58b6346 , < bde0238083647381d4747355c5a19115a3422b96 (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.1.11 , ≤ 7.1.* (semver) Unaffected: 7.2.1 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "lessThan": "86d12b34bafc9a4c271a9edefea88855a934d6e5",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "ff252ed45c8263525f2f54d81c5fa6d547fba344",
              "status": "affected",
              "version": "d9b05321e21e4b218de4ce8a590bf375f58b6346",
              "versionType": "git"
            },
            {
              "lessThan": "c4b4972d8edcdf50b6518f55119e129d2f668a10",
              "status": "affected",
              "version": "d9b05321e21e4b218de4ce8a590bf375f58b6346",
              "versionType": "git"
            },
            {
              "lessThan": "bde0238083647381d4747355c5a19115a3422b96",
              "status": "affected",
              "version": "d9b05321e21e4b218de4ce8a590bf375f58b6346",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.47",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix race on the initial mm-\u003efutex.phash.ref allocation\n\nfutex_hash_allocate() allocates mm-\u003efutex.phash.ref without any locking.\nCommit d9b05321e21e (\"futex: Move futex_hash_free() back to __mmput()\")\nmoved the allocation here and assumed that the process has just a single\nthread at this point.\n\nCommit ee9dce44362b (\"futex: Drop CLONE_THREAD requirement for private\ndefault hash alloc\") widened need_futex_hash_allocate_default() to cover\nany CLONE_VM clone, but left out vfork because the parent is suspended and\ncannot race.\n\nThat no longer holds once vfork is nested. If a vfork child calls vfork\nagain and is then killed with SIGKILL, the parent is released from its\nvfork wait and runs concurrently with the grandchild in the same mm.\nNeither of them went through futex_hash_allocate_default().\n\nWhen both call prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS) at the same\ntime, each one sees mm-\u003efutex.phash.ref as NULL and stores its own percpu\ncounter. Only the last store survives. The counter stored first is no\nlonger reachable from the mm, so the references on it are not seen by\n__futex_ref_atomic_end(). A private hash that still has references is then\nconsidered dead and freed, and a task that still holds one of its buckets\nwrites into freed memory in futex_q_lock().\n\nStore the counter once with cmpxchg() and let the loser free_percpu() its\nown. The initial reference has to be taken before the store, otherwise\nanother task can install a private hash while the counter is still 0."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:47.391Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86d12b34bafc9a4c271a9edefea88855a934d6e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff252ed45c8263525f2f54d81c5fa6d547fba344"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4b4972d8edcdf50b6518f55119e129d2f668a10"
        },
        {
          "url": "https://git.kernel.org/stable/c/bde0238083647381d4747355c5a19115a3422b96"
        }
      ],
      "title": "futex: Fix race on the initial mm-\u003efutex.phash.ref allocation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80775",
    "datePublished": "2026-09-04T15:12:47.391Z",
    "dateReserved": "2026-08-26T14:34:25.792Z",
    "dateUpdated": "2026-09-04T15:12:47.391Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

ALSA-2026:74438

CVE-2026-45856 (GCVE-0-2026-45856)

CVE-2026-63794 (GCVE-0-2026-63794)

CVE-2026-80775 (GCVE-0-2026-80775)

Tags

Sightings

Nomenclature

Related by attack behaviour