mm/vmalloc: take vmap_purge_lock in shrinker

Answer in brief

CVE-2026-46093 records a High severity (CVSS 7.8) vulnerability in mm/vmalloc: take vmap_purge_lock in shrinker. 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 May 27, 2026Updated Aug 5, 2026Source checked Sep 19, 2026First seen by HOL Jun 25, 2026Material review Aug 5, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. 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	>=7679ba6b36dbb300b757b672d6a32a606499e14b <c15ff206ba78820bf2873d0c668a882e99f4b631 \|\| >=7679ba6b36dbb300b757b672d6a32a606499e14b <687ccdf582169cd680aeaf24cc953807c4cd4345 \|\| >=7679ba6b36dbb300b757b672d6a32a606499e14b <12f2341b4c235d5593a433abac201c1c6725787f \|\| >=7679ba6b36dbb300b757b672d6a32a606499e14b <ec05f51f1e65bce95528543eb73fda56fd201d94	c15ff206ba78820bf2873d0c668a882e99f4b631, 687ccdf582169cd680aeaf24cc953807c4cd4345, 12f2341b4c235d5593a433abac201c1c6725787f, ec05f51f1e65bce95528543eb73fda56fd201d94
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c15ff206ba78820bf2873d0c668a882e99f4b631 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: take vmap_purge_lock in shrinker decay_va_pool_node() can be invoked concurrently from two paths: __purge_vmap_area_lazy() when pools are being purged, and the shrinker via vmap_node_shrink_scan(). However, decay_va_pool_node() is not safe to run concurrently, and the shrinker path currently lacks serialization, leading to races and possible leaks. Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker path to ensure serialization with purge users.

Quoted source text, attributed separately from HOL analysis.