CVE-2026-93150 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506394
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-93150 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
cgroup/cpuset: Make nr_deadline_tasks an atomic_t
The nr_deadline_tasks variable in the cpuset structure was introduced by commit 6c24849f5515 ("sched/cpuset: Keep track of SCHED_DEADLINE task in cpusets"). It is reported by sashiko [1] that nr_deadline_tasks can currently be modified by inc_dl_tasks_cs() under rq->lock and by cpuset_attach() under cpuset_mutex. So if both updates happen simultaneously, the nr_deadline_tasks variable can be corrupted leading to incorrect operations down the road.
Fix that by changing its type to atomic_t so that nr_deadline_tasks are always atomically updated. This fix patch is a low hanging fruit. It can handle some of the races between a concurrent sched_setscheduler() and cpuset_can_attach()/cpuset_attach() calls, but not all of them like the other issue raised by sashiko [2]. This will be handled hopefully in a future follow up patch.
[1] https://sashiko.dev/#/patchset/20260626181923.133658-1-longman%40redhat.com [2] https://sashiko.dev/#/patchset/20260630033344.352702-1-longman%40redhat.com
References
- https://security-tracker.debian.org/tracker/CVE-2026-93150
- https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565
- https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82
- https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb
- https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638