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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().

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 38 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-89697, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVDNVD · Received3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS (exploitation in 30 days)
0.70% · top 47% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.

Affected products

  • Linux · Linux

    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 3eec9d791968c177a4a8cda9af5c04f79dae09cb
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 9229d824b938f4fb0ea7a5dddade51735e6fe6f9
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 2150305134889fb2fc25228d35353bd2f6f29500
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < d823bf9285cdf4514873b85ab5a888878dd4e8f4
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 15ca3b64a69caa6194bed8f98a20ed90a11c11dd
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 533964d420d385e11b08dd4c56c66ef5dcccaf08
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < c4a409b86a92815181a8e9395c6bf1696ad19175
    • affected cc265089ce1b176dde963c74b53593446ee7f99a – < 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc
    • affected 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8
    • affected 3.18.46 – < 3.19
  • Linux · Linux

    • affected 4.2
    • unaffected < 4.2
    • unaffected 5.10.270 – ≤ 5.10.*
    • unaffected 5.15.221 – ≤ 5.15.*
    • unaffected 6.1.188 – ≤ 6.1.*
    • unaffected 6.6.157 – ≤ 6.6.*
    • unaffected 6.12.109 – ≤ 6.12.*
    • unaffected 6.18.50 – ≤ 6.18.*
    • unaffected 7.2.4 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

8

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .