dm-pcache: clamp the tail kset read to the segment data region (CVE-2026-80958) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80958

dm-pcache: clamp the tail kset read to the segment data region

Answer in brief

CVE-2026-80958 records a Unknown severity vulnerability in dm-pcache: clamp the tail kset read to the segment data region. 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 <2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <1ab55354368d071ebaee4d8c82313955eab65a04 \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <becf07e2b0053027495ecd671b1f82fb2e615f68	2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c, 1ab55354368d071ebaee4d8c82313955eab65a04, becf07e2b0053027495ecd671b1f82fb2e615f68
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 2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c 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: clamp the tail kset read to the segment data region The tail-kset read in cache_replay(), the writeback worker and the GC worker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment size rather than the data region. A tail near the segment end reads past the segment data into the following control area. Clamp the read to cache_seg_remain(), the data region.

Quoted source text, attributed separately from HOL analysis.