Critical severity9.1NVD Advisory· Published Sep 11, 2026· Updated Oct 19, 2026
CVE-2026-89697
CVE-2026-89697
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().
Affected products
4- osv-coords2 versions
>= 4.2.0, < 5.10.270+ 1 more
- (no CPE)range: >= 4.2.0, < 5.10.270
- (no CPE)range: < 7.2.6-1.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11ddnvd
- git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500nvd
- git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cbnvd
- git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddccnvd
- git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08nvd
- git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9nvd
- git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175nvd
- git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4nvd
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