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Review reviewHigh

CVE-2022-50095

Linux Linux, linux kernel

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_iti...

CVSS
7.8
EPSS
0.21%
11.6% percentile
CISA KEV
Not listed
Published
2025.06.18
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.21%
Technical severityCVSS 7.8

Vulnerability overview

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_iti...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 < 541840859ace9c2ccebc32fa9e376c7bd3def490, >= 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 < 9e255ed238fc67058df87b0388ad6d4b2ef3a2bd, >= 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 < e8cb6e8fd9890780f1bfcf5592889e1b879e779c, >= 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 < b2fc1723eb65abb83e00d5f011de670296af0b28, >= 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 < e362359ace6f87c201531872486ff295df306d13, >= 5.7, >= 5.7 < 5.10.137, >= 5.11 < 5.15.61, >= 5.16 < 5.18.18, >= 5.19 < 5.19.2
Fixed versions
5.10.137, 5.15.61, 5.18.18, 5.19.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416