CVE-2026-89697

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().

Score

CVSS 3.1 9.1 Critical

Status

Received - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11

Last modified

2026-10-19

Affected products

• Linux Kernel (Linux)

References

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