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CVE-2026-89697

CRITICALCVSS 9.1/10EPSS 0.60%

Last modified

CVE-2026-89697 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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().. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

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().

Metrics

CVSS 3.1
9.1/10

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

EPSS Probability
0.60%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= cc265089ce1b176dde963c74b53593446ee7f99a, < 3eec9d791968c177a4a8cda9af5c04f79dae09cb; >= cc265089ce1b176dde963c74b53593446ee7f99a, < 9229d824b938f4fb0ea7a5dddade51735e6fe6f9; >= cc265089ce1b176dde963c74b53593446ee7f99a, < 2150305134889fb2fc25228d35353bd2f6f29500; >= cc265089ce1b176dde963c74b53593446ee7f99a, < d823bf9285cdf4514873b85ab5a888878dd4e8f4; >= cc265089ce1b176dde963c74b53593446ee7f99a, < 15ca3b64a69caa6194bed8f98a20ed90a11c11dd; >= cc265089ce1b176dde963c74b53593446ee7f99a, < 533964d420d385e11b08dd4c56c66ef5dcccaf08; >= cc265089ce1b176dde963c74b53593446ee7f99a, < c4a409b86a92815181a8e9395c6bf1696ad19175; >= cc265089ce1b176dde963c74b53593446ee7f99a, < 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc; 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8; >= 3.18.46, < 3.19
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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().
How severe is CVE-2026-89697?
CVE-2026-89697 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89697?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST