CVE-2026-80956

kernel: dm-pcache: only hand out initialized cache segments

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 11, 2026

Updated · September 29, 2026

Description

A flaw was found in the Linux kernel's dm-pcache component. A crafted image can cause the get_cache_segment() function to return an uninitialized cache segment. This uninitialized segment, containing a null data pointer, is then used by cache_kset_close() without a proper null check. This can lead to a system crash, resulting in a Denial of Service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-824 · Access of Uninitialized Pointer