FKIE_CVE-2026-53166

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-06-30 14:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock When FUTEX_CMP_REQUEUE_PI requeues a non-top waiter that already owns the target PI futex, task_blocks_on_rt_mutex() returns -EDEADLK before setting waiter->task. The subsequent remove_waiter() in rt_mutex_start_proxy_lock() dereferences the NULL waiter->task, causing a kernel crash. Add a self-deadlock check for non-top waiters before calling rt_mutex_start_proxy_lock(), analogous to the top-waiter check in futex_lock_pi_atomic().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16f8e17184b31382076f84751db5ac51fc02733e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f2f3f3eacd6653ab215c5d2ea70811148d433fc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74e144274af39935b0f410c0ee4d2b91c3730414
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/requeue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "16f8e17184b31382076f84751db5ac51fc02733e",
              "status": "affected",
              "version": "3fb7394a837740770f0d6b4b30567e60786a63f2",
              "versionType": "git"
            },
            {
              "lessThan": "1f2f3f3eacd6653ab215c5d2ea70811148d433fc",
              "status": "affected",
              "version": "88614876370aac8ad1050ad785a4c095ba17ac11",
              "versionType": "git"
            },
            {
              "lessThan": "74e144274af39935b0f410c0ee4d2b91c3730414",
              "status": "affected",
              "version": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d8cce4773c2b23d819baf5abedc62f7b430e8745",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.86",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/requeue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.18.36",
              "status": "affected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThan": "7.0.13",
              "status": "affected",
              "version": "7.0.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock\n\nWhen FUTEX_CMP_REQUEUE_PI requeues a non-top waiter that already owns the\ntarget PI futex, task_blocks_on_rt_mutex() returns -EDEADLK before setting\nwaiter-\u003etask.\n\nThe subsequent remove_waiter() in rt_mutex_start_proxy_lock() dereferences\nthe NULL waiter-\u003etask, causing a kernel crash.\n\nAdd a self-deadlock check for non-top waiters before calling\nrt_mutex_start_proxy_lock(), analogous to the top-waiter check in\nfutex_lock_pi_atomic()."
    }
  ],
  "id": "CVE-2026-53166",
  "lastModified": "2026-06-30T14:44:27.313",
  "metrics": {},
  "published": "2026-06-25T09:16:33.983",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16f8e17184b31382076f84751db5ac51fc02733e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1f2f3f3eacd6653ab215c5d2ea70811148d433fc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/74e144274af39935b0f410c0ee4d2b91c3730414"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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