dm-pcache: fix use-after-free and invalid seg operations in kset_replay() (CVE-2026-80955) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80955

dm-pcache: fix use-after-free and invalid seg operations in kset_replay()

Answer in brief

CVE-2026-80955 records a Unknown severity vulnerability in dm-pcache: fix use-after-free and invalid seg operations in kset_replay(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <1894fc7a3bab90143dcd26ef8ee27040ef4a7501 \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <f39a3e9cc5946473e16d6f5071b2ee0216c56d06 \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <c2e894eac398b258f12fdec73ed6ba081047f7b3	1894fc7a3bab90143dcd26ef8ee27040ef4a7501, f39a3e9cc5946473e16d6f5071b2ee0216c56d06, c2e894eac398b258f12fdec73ed6ba081047f7b3
Linux/Linuxgeneric	6.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 1894fc7a3bab90143dcd26ef8ee27040ef4a7501 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: fix use-after-free and invalid seg operations in kset_replay() In kset_replay, when key->seg_gen is stale (key->seg_gen < key->cache_pos.cache_seg->gen), cache_key_put(key) is called but then key->cache_pos.cache_seg is accessed as the argument to cache_seg_get(). This is a use-after-free on the freed key memory. Although mempool recycled memory is not immediately reclaimed or overwritten in practice, this is still a potential UAF bug. Additionally, for expired invalid keys, setting the cache->seg_map bit and calling cache_seg_get() is unreasonable since the corresponding segment data is no longer valid. Fix both issues by moving cache_seg_get() and __set_bit() after the gen check, so they only execute for valid keys, and using continue to skip invalid keys.

Quoted source text, attributed separately from HOL analysis.