{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d8cce4773c2b23d819baf5abedc62f7b430e8745"
            },
            {
              "fixed": "4afda3a1da02129568a3a2f1898aa13e6763bcba"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f"
            },
            {
              "fixed": "6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166"
            },
            {
              "fixed": "5799f9bd7fee40370b93ab1ddf001cdc7017c14d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
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              "introduced": "3fb7394a837740770f0d6b4b30567e60786a63f2"
            },
            {
              "fixed": "a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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              "introduced": "88614876370aac8ad1050ad785a4c095ba17ac11"
            },
            {
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            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"
            },
            {
              "fixed": "40a25d59e85b3c8709ac2424d44f65610467871e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.175"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.6.140"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.12.86"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "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-2026-53163.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/rtmutex: Skip remove_waiter() when waiter is not enqueued\n\nsyzbot triggered the following splat in remove_waiter() via\nFUTEX_CMP_REQUEUE_PI:\n\n  KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f]\n   class_raw_spinlock_constructor\n   remove_waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561\n   rt_mutex_start_proxy_lock+0x103/0x120\n   futex_requeue+0x10e4/0x20d0\n   __x64_sys_futex+0x34f/0x4d0\n\ntask_blocks_on_rt_mutex() does not arm the waiter upon deadlock detection,\nleaving waiter-\u003etask nil, where 3bfdc63936dd (\"rtmutex: Use waiter::task instead\nof current in remove_waiter()\") made this fatal.\n\nFurthermore, rt_mutex_start_proxy_lock() should not be calling into remove_waiter()\nupon a successfully grabbing the rtmutex. 1a1fb985f2e2 (\"futex: Handle early deadlock\nreturn correctly\"), moved the remove_waiter() out of __rt_mutex_start_proxy_lock()\n(where 'ret' was only ever 0 or \u003c 0) into the wrapper. Tighten this check to\naccount for try_to_take_rt_mutex().",
  "id": "CVE-2026-53163",
  "modified": "2026-07-09T03:52:18.411474618Z",
  "published": "2026-06-25T08:38:44.108Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53163.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53163"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "locking/rtmutex: Skip remove_waiter() when waiter is not enqueued"
}