CVE-2026-80963 dm-stats: fix a crash if allocation of per-cpu data fails
A local attacker can cause a kernel crash via null pointer dereference in dm-stats when per-cpu data allocation fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80963?
CVE-2026-80963 is a vulnerability in Linux, published on 11 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dm-stats: fix a crash if allocation of per-cpu data fails
If "dm_kvzalloc(percpu_alloc_size, cpu_to_node(cpu))" fails, the code jumps to the "out" label and calls dm_stat_free. dm_stat_free does "for_each_possible_cpu(cpu) { dm_kvfree(s->stat_percpu[cpu][0].histogram, s->histogram_alloc_size);", which crashes with NULL pointer dereference if s->stat_percpu[cpu] is NULL.
This commit fixes the bug by testing s->stat_percpu[cpu] for NULL before using it.
Which versions are affected by CVE-2026-80963?
How do I fix CVE-2026-80963?
Apply the vendor's patch.
Is CVE-2026-80963 being exploited?
There is no known exploitation of CVE-2026-80963 in the wild and no public exploit code.
Sources
Also known as AZL-100854, BELL-CVE-2026-80963, DEBIAN-CVE-2026-80963, GHSA-vfhr-8gq2-gpcv, UBUNTU-CVE-2026-80963.