netfs: Fix netfs_create_write_req() to handle async cache object creation (CVE-2026-72366) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-72366

netfs: Fix netfs_create_write_req() to handle async cache object creation

Answer in brief

CVE-2026-72366 records a Critical severity (CVSS 9.8) vulnerability in netfs: Fix netfs_create_write_req() to handle async cache object creation. 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 Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. 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	>=7b589a9b45ae32aa9d7bece597490e141198d7a6 <8ab75e445c161c4cb504aa98e20ce1dd1ecd8e9a \|\| >=7b589a9b45ae32aa9d7bece597490e141198d7a6 <1188a9846fadeacf9d1430b528e5217f749d665b \|\| >=7b589a9b45ae32aa9d7bece597490e141198d7a6 <dbd6f56d975b23241b7bbb11bb8f562af548a0aa	8ab75e445c161c4cb504aa98e20ce1dd1ecd8e9a, 1188a9846fadeacf9d1430b528e5217f749d665b, dbd6f56d975b23241b7bbb11bb8f562af548a0aa
Linux/Linuxgeneric	6.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8ab75e445c161c4cb504aa98e20ce1dd1ecd8e9a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_create_write_req() to handle async cache object creation netfs_create_write_req() will skip caching if the fscache cookie is disabled, but this is a problem because async cache object creation might not have got far enough yet that has been enabled - thereby causing the call to fscache_begin_write_operation() to be skipped. Fix this by removing the checks on the cookie and delegating this to fscache_begin_write_operation().

Quoted source text, attributed separately from HOL analysis.