Riskcovery

CVE-2022-50095

posix-cpu-timers: Cleanup CPU timers before freeing them during exec

State
Published
Severity
7.8 High
Published
Jun 18, 2025
Updated
Aug 5, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

Description

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

posix-cpu-timers: Cleanup CPU timers before freeing them during exec

Commit 55e8c8eb2c7b ("posix-cpu-timers: Store a reference to a pid not a task") started looking up tasks by PID when deleting a CPU timer.

When a non-leader thread calls execve, it will switch PIDs with the leader process. Then, as it calls exit_itimers, posix_cpu_timer_del cannot find the task because the timer still points out to the old PID.

That means that armed timers won't be disarmed, that is, they won't be removed from the timerqueue_list. exit_itimers will still release their memory, and when that list is later processed, it leads to a use-after-free.

Clean up the timers from the de-threaded task before freeing them. This prevents a reported use-after-free.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 to before 541840859ace9c2ccebc32fa9e376c7bd3def490Affected
  • 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 to before 9e255ed238fc67058df87b0388ad6d4b2ef3a2bdAffected
  • 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 to before e8cb6e8fd9890780f1bfcf5592889e1b879e779cAffected
  • 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 to before b2fc1723eb65abb83e00d5f011de670296af0b28Affected
  • 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 to before e362359ace6f87c201531872486ff295df306d13Affected
LinuxLinux
  • 5.7Affected
  • before 5.7Not affected
  • 5.10.137 through 5.10.*Not affected
  • 5.15.61 through 5.15.*Not affected
  • 5.18.18 through 5.18.*Not affected
  • 5.19.2 through 5.19.*Not affected
  • 6.0 and laterNot affected

References

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