Vulnerability-Lookup

GHSA-5F39-WJPQ-XRRJ

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

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().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53166"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:33Z",
    "severity": null
  },
  "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": "GHSA-5f39-wjpq-xrrj",
  "modified": "2026-06-25T09:31:19Z",
  "published": "2026-06-25T09:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53166"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53166 (GCVE-0-2026-53166)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38

Title

futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock

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().

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/16f8e17184b313820…
https://git.kernel.org/stable/c/1f2f3f3eacd6653ab…
https://git.kernel.org/stable/c/74e144274af39935b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3fb7394a837740770f0d6b4b30567e60786a63f2 , < 16f8e17184b31382076f84751db5ac51fc02733e (git) Affected: 88614876370aac8ad1050ad785a4c095ba17ac11 , < 1f2f3f3eacd6653ab215c5d2ea70811148d433fc (git) Affected: 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 , < 74e144274af39935b0f410c0ee4d2b91c3730414 (git) Affected: d8cce4773c2b23d819baf5abedc62f7b430e8745 (git) Affected: 8a1fc8d698ac5e5916e3082a0f74450d71f9611f (git) Affected: 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 (git) Affected: 6.1.175 , < 6.2 (semver) Affected: 6.6.140 , < 6.7 (semver) Affected: 6.12.86 , < 6.13 (semver)
Linux	Linux	Affected: 6.18.27 , < 6.18.36 (semver) Affected: 7.0.4 , < 7.0.13 (semver)

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          "programFiles": [
            "kernel/futex/requeue.c"
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          "vendor": "Linux",
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    "datePublished": "2026-06-25T08:38:46.089Z",
    "dateReserved": "2026-06-09T07:44:35.389Z",
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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.

Action not permitted

GHSA-5F39-WJPQ-XRRJ

CVE-2026-53166 (GCVE-0-2026-53166)

Tags

Sightings

Nomenclature