CVE-2024-46829: rtmutex: Drop rt_mutex::wait_lock before scheduling

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-27 · updated 2026-06-17
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: rtmutex: Drop rt_mutex::wait_lock before scheduling rt_mutex_handle_deadlock() is called with rt_mutex::wait_lock held. In the good case it returns with the lock held and in the deadlock case it emits a warning and goes into an endless scheduling loop with the lock held, which triggers the 'scheduling in atomic' warning. Unlock rt_mutex::wait_lock in the dead lock case before issuing the warning and dropping into the schedule for ever loop. [ tglx: Moved unlock before the WARN(), removed the pointless comment, massaged changelog, added Fixes tag ]

Affected products

Linux kernel: from 3.2.61 before 3.3; from 3.4.99 before 3.5; from 3.10.49 before 3.11; from 3.12.25 before 3.13; from 3.14.10 before 3.15; from 3.15.3 before 3.16 — fixed in 3.11, 3.13, 3.15, 3.16, 3.3, 3.5

How to fix

Upgrade to a fixed version: Linux kernel 3.11, 3.13, 3.15, 3.16. Check the vendor advisory for mitigations.

References

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