CVE-2022-50095
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-50095
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50095.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-50095
- Related
- Published
- 2025-06-18T11:15:38Z
- Modified
- 2025-06-18T16:48:16.926733Z
- Downstream
- Summary
- [none]
- Details
-
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 exititimers, posixcputimerdel 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 timerqueuelist. exititimers 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.
- References
-
- https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490
- https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bd
- https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28
- https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13
- https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779c
- https://security-tracker.debian.org/tracker/CVE-2022-50095
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.10.140-1
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source