CVE Catalog

CVE-2026-80963

Low risk· EPSS 7%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.18%

7th percentile - higher than 7% of all known CVEs

Summary

In the Linux kernel, the dm-stats module has a bug where if per-CPU data allocation (dm_kvzalloc) fails, the code jumps to the "out" label and calls dm_stat_free, which dereferences s->stat_percpu[cpu] without a NULL check. This causes a NULL pointer dereference and kernel crash. The fix adds a NULL check before using the pointer.

Risk Assessment

A kernel crash (NULL pointer dereference) can occur under memory pressure conditions, causing denial of service (DoS) on systems using dm-stats. Exploitation requires specific allocation failure conditions.

Recommendation

Update the Linux kernel to a version containing the dm-stats module fix. Monitor systems for unexpected reboots under high memory load.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS