block: mark GFP_NOIO around sysfs ->store()

Answer in brief

CVE-2025-21817 records a Unknown severity vulnerability in block: mark GFP_NOIO around sysfs ->store(). 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 Feb 27, 2025Updated Sep 7, 2026Source checked Sep 7, 2026First seen by HOL Sep 7, 2026Material review Sep 7, 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	>=1645cd7fd42c236c952e9228badcac4fea1829ea <a09280c39ea54080daf19cfaf4a3121a8d17d5cd \|\| >=8985da5481562e96b95e94ed8e5cc9b6565eb82b <2566ce907e5d5db8a039647208e029ce559baa31 \|\| >=c99f66e4084a62a2cc401c4704a84328aeddc9ec <7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c	a09280c39ea54080daf19cfaf4a3121a8d17d5cd, 2566ce907e5d5db8a039647208e029ce559baa31, 7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c
Linux/Linuxgeneric	>=6.12.96 <6.12.109 \|\| >=6.13.2 <6.13.3	6.12.109, 6.13.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a09280c39ea54080daf19cfaf4a3121a8d17d5cd; Linux/Linux to 6.12.109 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 7, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: block: mark GFP_NOIO around sysfs ->store() sysfs ->store is called with queue freezed, meantime we have several ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate memory with GFP_KERNEL which may run into direct reclaim code path, then potential deadlock can be caused. Fix the issue by marking NOIO around sysfs ->store()

Quoted source text, attributed separately from HOL analysis.