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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38
VLAI
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
References
Impacted 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)
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Linux Linux Affected: 6.18.27 , < 6.18.36 (semver)
Affected: 7.0.4 , < 7.0.13 (semver)
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            "kernel/futex/requeue.c"
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          "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()."
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    "datePublished": "2026-06-25T08:38:46.089Z",
    "dateReserved": "2026-06-09T07:44:35.389Z",
    "dateUpdated": "2026-06-25T08:38:46.089Z",
    "state": "PUBLISHED"
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}


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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.

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  • 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.
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