Riskcovery

CVE-2023-53815

posix-timers: Prevent RT livelock in itimer_delete()

State
Published
Severity
Not scored
Published
Dec 9, 2025
Updated
May 11, 2026
Reserved
Dec 8, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

posix-timers: Prevent RT livelock in itimer_delete()

itimer_delete() has a retry loop when the timer is concurrently expired. On non-RT kernels this just spin-waits until the timer callback has completed, except for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK enabled.

In that case and on RT kernels the existing task could live lock when preempting the task which does the timer delivery.

Replace spin_unlock() with an invocation of timer_wait_running() to handle it the same way as the other retry loops in the posix timer code.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before f1be1ed32daa053484222f7f9beb2b16c624dffdAffected
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before 0670c4c567b27bd8f999a943028f4fe60d1a1106Affected
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before e7aff15ba29ba4b3052786b1636fa5c4aa39e179Affected
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before f9bd298e3e4d3fd6e19f017789a42d0f332cd555Affected
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before c1968bb8a28625cc95d2ad3ca872ab98c9c36d59Affected
  • ec8f954a40da8cd3d159713b608e901f0cd909a9 to before 9d9e522010eb5685d8b53e8a24320653d9d4cbbfAffected
LinuxLinux
  • 5.4Affected
  • before 5.4Not affected
  • 5.10.188 through 5.10.*Not affected
  • 5.15.121 through 5.15.*Not affected
  • 6.1.39 through 6.1.*Not affected
  • 6.3.13 through 6.3.*Not affected
  • 6.4.4 through 6.4.*Not affected
  • 6.5 and laterNot affected

References

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