CVE-2022-50095

HIGH EPSS 10.9%
Published Jun 18, 20251y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Jun 18, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
10.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.7  –  <5.10.137
linuxlinux_kernel*≥5.11  –  <5.15.61
linuxlinux_kernel*≥5.16  –  <5.18.18
linuxlinux_kernel*≥5.19  –  <5.19.2

References 5

  • git.kernel.org https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779c
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779c
    Patch