dm-pcache: validate the persisted dirty_tail chain at load (CVE-2026-93198) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93198

dm-pcache: validate the persisted dirty_tail chain at load

Answer in brief

CVE-2026-93198 records a Unknown severity vulnerability in dm-pcache: validate the persisted dirty_tail chain at load. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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 <8195cf3f4a82ef49d9b0651c507ed0784caf23fb \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <4822a030929e0e77aa380722dc42e3e4c9edd346 \|\| >=1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 <58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b	8195cf3f4a82ef49d9b0651c507ed0784caf23fb, 4822a030929e0e77aa380722dc42e3e4c9edd346, 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b
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 8195cf3f4a82ef49d9b0651c507ed0784caf23fb if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.

Quoted source text, attributed separately from HOL analysis.