{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3fb7394a837740770f0d6b4b30567e60786a63f2"
            },
            {
              "fixed": "16f8e17184b31382076f84751db5ac51fc02733e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "88614876370aac8ad1050ad785a4c095ba17ac11"
            },
            {
              "fixed": "1f2f3f3eacd6653ab215c5d2ea70811148d433fc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"
            },
            {
              "fixed": "74e144274af39935b0f410c0ee4d2b91c3730414"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "d8cce4773c2b23d819baf5abedc62f7b430e8745"
            },
            {
              "last_affected": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f"
            },
            {
              "last_affected": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.175"
            },
            {
              "fixed": "6.2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.140"
            },
            {
              "fixed": "6.7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.86"
            },
            {
              "fixed": "6.13"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.27"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.0.4"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53166.json"
  },
  "details": "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",
  "modified": "2026-07-09T03:51:26.361798120Z",
  "published": "2026-06-25T08:38:46.089Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16f8e17184b31382076f84751db5ac51fc02733e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f2f3f3eacd6653ab215c5d2ea70811148d433fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74e144274af39935b0f410c0ee4d2b91c3730414"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53166.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53166"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock"
}