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CVE-2026-53163 (GCVE-0-2026-53163)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-07-24 14:33
VLAI
Title
locking/rtmutex: Skip remove_waiter() when waiter is not enqueued
Summary
In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued syzbot triggered the following splat in remove_waiter() via FUTEX_CMP_REQUEUE_PI: KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f] class_raw_spinlock_constructor remove_waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561 rt_mutex_start_proxy_lock+0x103/0x120 futex_requeue+0x10e4/0x20d0 __x64_sys_futex+0x34f/0x4d0 task_blocks_on_rt_mutex() does not arm the waiter upon deadlock detection, leaving waiter->task nil, where 3bfdc63936dd ("rtmutex: Use waiter::task instead of current in remove_waiter()") made this fatal. Furthermore, rt_mutex_start_proxy_lock() should not be calling into remove_waiter() upon a successfully grabbing the rtmutex. 1a1fb985f2e2 ("futex: Handle early deadlock return correctly"), moved the remove_waiter() out of __rt_mutex_start_proxy_lock() (where 'ret' was only ever 0 or < 0) into the wrapper. Tighten this check to account for try_to_take_rt_mutex().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f3fa3424bceb128d2be4b3745506b22844b87db7 , < bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1 (git)
Affected: 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd , < 4ffacf76a457b7ca8ac05f5df8740b0d8f53574a (git)
Affected: d8cce4773c2b23d819baf5abedc62f7b430e8745 , < 4afda3a1da02129568a3a2f1898aa13e6763bcba (git)
Affected: 8a1fc8d698ac5e5916e3082a0f74450d71f9611f , < 6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48 (git)
Affected: 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 , < 5799f9bd7fee40370b93ab1ddf001cdc7017c14d (git)
Affected: 3fb7394a837740770f0d6b4b30567e60786a63f2 , < a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53 (git)
Affected: 88614876370aac8ad1050ad785a4c095ba17ac11 , < 55363fa0a04524d11efeaadee734d2db1756ed27 (git)
Affected: 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 , < 40a25d59e85b3c8709ac2424d44f65610467871e (git)
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Linux Linux Affected: 6.1.175 , < 6.1.177 (semver)
Affected: 6.6.140 , < 6.6.144 (semver)
Affected: 6.12.86 , < 6.12.95 (semver)
Affected: 6.18.27 , < 6.18.36 (semver)
Affected: 7.0.4 , < 7.0.13 (semver)
guessed Create a notification for this product.
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            "url": "https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-07T18:57:53+00:00",
      "cve": "CVE-2026-53163",
      "id": "CVE-2026-53163",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53163.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:52:12Z",
      "cve": "CVE-2026-53163",
      "id": "CVE-2026-53163",
      "initial_release_date": "2026-06-26T02:11:35Z",
      "product_status:first_fixed": "127",
      "product_status:known_affected": "634",
      "product_status:known_not_affected": "111",
      "product_status:recommended": "122",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53163",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53163.json",
      "version": "11"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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.