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  4. CVE 2025 21817 block mark gfpnoio around sysfs store
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Back to active CVEs
Medium · CVSS 5.5CVE-2025-21817

block: mark GFP_NOIO around sysfs ->store()CVE-2025-21817

Answer in brief

CVE-2025-21817 records a Medium severity (CVSS 5.5) 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 Oct 22, 2026First seen by HOL Sep 7, 2026Material review Sep 7, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.5. 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.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:6.13.2:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1645cd7fd42c236c952e9228badcac4fea1829ea <a09280c39ea54080daf19cfaf4a3121a8d17d5cd || >=8985da5481562e96b95e94ed8e5cc9b6565eb82b <2566ce907e5d5db8a039647208e029ce559baa31 || >=c99f66e4084a62a2cc401c4704a84328aeddc9ec <7c0be4ead1f8f5f8be0803f347de0de81e3b8e1ca09280c39ea54080daf19cfaf4a3121a8d17d5cd, 2566ce907e5d5db8a039647208e029ce559baa31, 7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c
Linux/Linuxgeneric>=6.12.96 <6.12.109 || >=6.13.2 <6.13.36.12.109, 6.13.3

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review 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

  1. Published upstream

    Feb 27, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 7, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
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.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-667
Source
CVE List V5
Source checked
Oct 22, 2026
References
3 linked sources
Open source record