Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.7, < 5.10.137 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490Patch
- https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bdPatch
- https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28Patch
- https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13Patch
- https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779cPatch
FAQ
What is CVE-2022-50095?
CVE-2022-50095 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2022-50095?
CVE-2022-50095 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-50095?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.