CVE-2022-50095

Advisory lineage Upstream: 0 Downstream: 8
Analyzed
Published: 18 Jun 2025, 11:02
Last modified:11 May 2026, 19:12

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.06% LOW
0% probability +0.05%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Jun 2025, 11:02
Published
Vulnerability first disclosed
11 May 2026, 19:12
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.06%• Percentile: 20%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • linux•linux

    ≥ 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59, < 541840859ace9c2ccebc32fa9e376c7bd3def490 | ≥ 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59, < 9e255ed238fc67058df87b0388ad6d4b2ef3a2bd | ≥ 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59, < e8cb6e8fd9890780f1bfcf5592889e1b879e779c | ≥ 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59, < b2fc1723eb65abb83e00d5f011de670296af0b28 | ≥ 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59, < e362359ace6f87c201531872486ff295df306d13 | 5.7

  • linux•linux_kernel

    ≥ 5.7, < 5.10.137 | ≥ 5.11, < 5.15.61 | ≥ 5.16, < 5.18.18 | ≥ 5.19, < 5.19.2

References (5)