netfs: Fix uninitialized return value in netfs_unbuffered_write() (CVE-2026-97610) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97610

netfs: Fix uninitialized return value in netfs_unbuffered_write()

Answer in brief

CVE-2026-97610 records a Unknown severity vulnerability in netfs: Fix uninitialized return value in netfs_unbuffered_write(). 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 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	>=72d08d2839649d1c5efbe375751f4473fa4486af <3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26 \|\| >=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <2e38d500471d097cda87d7d374bbc1b13493075d \|\| >=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <f18e8774f4d3137fa0a5fb8ffa83d59a719666d8 \|\| 0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0 \|\| >=6.18.17 <6.18.53 \|\| >=6.19.7 <6.20	3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26, 2e38d500471d097cda87d7d374bbc1b13493075d, f18e8774f4d3137fa0a5fb8ffa83d59a719666d8, 6.18.53, 6.20
Linux/Linuxgeneric	7.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix uninitialized return value in netfs_unbuffered_write() If preparation of the first subrequest fails, netfs_unbuffered_write() exits its loop before ret is initialized. The empty-iterator check can do the same. For synchronous writes, netfs_unbuffered_write_iter_locked() may then return an unrelated error instead of wreq->error. This is reachable through CIFS if cifs_prepare_write() fails to reopen the file or obtain credits. Initialize ret to 0 so the caller returns wreq->error if no data was written, or the number of bytes already written otherwise. Found with Clang's -Wconditional-uninitialized.

Quoted source text, attributed separately from HOL analysis.