CVE-2026-89697
nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()
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().
INFO
Published Date :
Sept. 11, 2026, 8:19 p.m.
Last Modified :
Sept. 14, 2026, 1:19 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Add fh_want_write() call after early fh_verify.
- Ensure notify_change() has mount write reference.
- Update the Linux kernel to the latest version.
References to Advisories, Solutions, and Tools
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CVE-2026-89697.
CWE - Common Weakness Enumeration
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
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approaches employed by adversaries to exploit the CVE-2026-89697
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-89697 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-89697 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 14, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89697.json">CVE-2026-89697</a> Added Reference https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500 Added Reference https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb Added Reference https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9 Added Reference https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 11, 2026
Action Type Old Value New Value Added 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(). Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89697.json">CVE-2026-89697</a> Added Reference https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd Added Reference https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc Added Reference https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08 Added Reference https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175