nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr() (CVE-2026-89697) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89697

nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()

Answer in brief

CVE-2026-89697 records a Unknown severity vulnerability in nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr(). 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 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=cc265089ce1b176dde963c74b53593446ee7f99a <15ca3b64a69caa6194bed8f98a20ed90a11c11dd \|\| >=cc265089ce1b176dde963c74b53593446ee7f99a <533964d420d385e11b08dd4c56c66ef5dcccaf08 \|\| >=cc265089ce1b176dde963c74b53593446ee7f99a <c4a409b86a92815181a8e9395c6bf1696ad19175 \|\| >=cc265089ce1b176dde963c74b53593446ee7f99a <4e475be769aa9f7a2c1ce55a2b8592cfccacddcc \|\| 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8 \|\| >=3.18.46 <3.19	15ca3b64a69caa6194bed8f98a20ed90a11c11dd, 533964d420d385e11b08dd4c56c66ef5dcccaf08, c4a409b86a92815181a8e9395c6bf1696ad19175, 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc, 3.19
Linux/Linuxgeneric	4.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 15ca3b64a69caa6194bed8f98a20ed90a11c11dd if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr() The BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare() can inspect the dentry. This causes nfsd_setattr() to skip fh_want_write(), so notify_change() runs without a mount write reference. Add the missing fh_want_write() call after the early fh_verify().

Quoted source text, attributed separately from HOL analysis.