dm-pcache: detect a cycle in the last-kset chain during replay (CVE-2026-80957) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80957

dm-pcache: detect a cycle in the last-kset chain during replay

Answer in brief

CVE-2026-80957 records a Unknown severity vulnerability in dm-pcache: detect a cycle in the last-kset chain during 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 <663ee2f3824a505b983162de44134e789f8230da \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <5311dfc5cd70edccd110257e3f30b2c1dcd3768d \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <16c3b3a326e70f246a605b3dc27b7f83ba4743e3	663ee2f3824a505b983162de44134e789f8230da, 5311dfc5cd70edccd110257e3f30b2c1dcd3768d, 16c3b3a326e70f246a605b3dc27b7f83ba4743e3
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 663ee2f3824a505b983162de44134e789f8230da 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: detect a cycle in the last-kset chain during replay cache_replay() follows the on-media last-kset chain by next_cache_seg_id with no cond_resched(). A forged chain that points back into a segment it has already visited makes the replay loop follow it forever. Cap the last-kset hops at cache->n_segs; a valid chain visits each segment at most once.

Quoted source text, attributed separately from HOL analysis.