linux — security advisory
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.
- Products
- linux
- Affected versions
- Not specified
- Fixed versions
- 6.0.2-1
- CVEs
- CVE-2022-50095
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 15:42 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2022-50095
linux
Fixed versions: 6.0.2-1
linux
Fixed versions: 6.0.2-1
linux
Fixed versions: 6.0.2-1
Complete source record
{
"id": "dd774ed49173c72e12b8f75ed24011ddd0cb13199a6f5445ddc5ae390bfe46be",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2022-50095",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2022-50095",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2022-50095",
"products": [
{
"name": {
"value": "linux",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/0/ranges"
}
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},
{
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"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
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}
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"affected": [
{
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"ecosystem": "Debian:12"
},
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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"package": {
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"purl": "pkg:deb/debian/linux?arch=source&distro=trixie",
"ecosystem": "Debian:13"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50095.json"
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{
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"package": {
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"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50095.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-15T08:03:12.509120222Z",
"provider": "osv",
"upstream": [
"CVE-2022-50095"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2022-50095"
]
},
"related_cves": [
{
"value": "CVE-2022-50095",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 325734,
"published_at": "2025-06-18T11:15:38.74+00:00"
}