Bug 2532144 (CVE-2026-89697) - CVE-2026-89697 kernel: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()
Summary: CVE-2026-89697 kernel: nfsd: add fh_want_write() for early-verified SETATTR i...
Keywords:
Status: NEW
Alias: CVE-2026-89697
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-11 20:55 UTC by OSIDB Bzimport
Modified: 2026-09-15 19:09 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-11 20:55:08 UTC 
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().
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