dm-pcache: bound the persisted tail-position offset (CVE-2026-80959) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80959

dm-pcache: bound the persisted tail-position offset

Answer in brief

CVE-2026-80959 records a Unknown severity vulnerability in dm-pcache: bound the persisted tail-position offset. 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 <ffd9a214a94f9928e54856f42b1cc3e33fb10e36 \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <8bf7a06ca3c1611809725f58cfd573f2ffbda75f \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <d1898576090a10d2ac2715218a652e78fb65a6b0	ffd9a214a94f9928e54856f42b1cc3e33fb10e36, 8bf7a06ca3c1611809725f58cfd573f2ffbda75f, d1898576090a10d2ac2715218a652e78fb65a6b0
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 ffd9a214a94f9928e54856f42b1cc3e33fb10e36 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: bound the persisted tail-position offset cache_pos_decode() takes the persisted key_tail and dirty_tail seg_off from the cache device and addresses within the segment with it. A seg_off at or past the segment data_size, controllable by whoever supplies the device (CAP_SYS_ADMIN), reads past the segment data. Reject a decoded seg_off that is not below the segment data_size.

Quoted source text, attributed separately from HOL analysis.