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().

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00173.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
3fb7394a837740770f0d6b4b30567e60786a63f2 affected < 16f8e17184b31382076f84751db5ac51fc02733e
88614876370aac8ad1050ad785a4c095ba17ac11 affected < 1f2f3f3eacd6653ab215c5d2ea70811148d433fc
3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 affected < 74e144274af39935b0f410c0ee4d2b91c3730414
d8cce4773c2b23d819baf5abedc62f7b430e8745 affected —
8a1fc8d698ac5e5916e3082a0f74450d71f9611f affected —
6d52dfcb2a5db86e346cf51f8fcf2071b8085166 affected —
6.1.175 affected < 6.2
6.6.140 affected < 6.7
6.12.86 affected < 6.13
Linux Linux unaffected
Version Status Constraints
6.18.27 affected < 6.18.36
7.0.4 affected < 7.0.13

No data.

No data.

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/16f8e17184b31382076f84751db5ac51fc02733e cve-icon
https://git.kernel.org/stable/c/1f2f3f3eacd6653ab215c5d2ea70811148d433fc cve-icon
https://git.kernel.org/stable/c/74e144274af39935b0f410c0ee4d2b91c3730414 cve-icon
History

Thu, 25 Jun 2026 12:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description 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().
Title futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:38:46.089Z

Reserved: 2026-06-09T07:44:35.389Z

Link: CVE-2026-53166

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T14:30:05Z

Weaknesses