CVE-2026-89697critical

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

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.7%

exploitation probability

0.7%top 49% of all CVEs

observed exploitation

nono source reports it

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().

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500 https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08 https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9 https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175 https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4