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().

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89697

Mitre link : CVE-2026-89697

CVE.ORG link : CVE-2026-89697

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89697", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "3eec9d791968c177a4a8cda9af5c04f79dae09cb", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "9229d824b938f4fb0ea7a5dddade51735e6fe6f9", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "2150305134889fb2fc25228d35353bd2f6f29500", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "d823bf9285cdf4514873b85ab5a888878dd4e8f4", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "15ca3b64a69caa6194bed8f98a20ed90a11c11dd", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "533964d420d385e11b08dd4c56c66ef5dcccaf08", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "c4a409b86a92815181a8e9395c6bf1696ad19175", "versionType": "git"}, {"status": "affected", "version": "cc265089ce1b176dde963c74b53593446ee7f99a", "lessThan": "4e475be769aa9f7a2c1ce55a2b8592cfccacddcc", "versionType": "git"}, {"status": "affected", "version": "1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8", "versionType": "git"}, {"status": "affected", "version": "3.18.46", "lessThan": "3.19", "versionType": "semver"}], "programFiles": ["fs/nfsd/nfsproc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"status": "unaffected", "version": "0", "lessThan": "4.2", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfsd/nfsproc.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:56.843", "references": [{"url": "https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()\n\nThe BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()\ncan inspect the dentry. This causes nfsd_setattr() to skip\nfh_want_write(), so notify_change() runs without a mount write\nreference.\n\nAdd the missing fh_want_write() call after the early fh_verify()."}], "lastModified": "2026-09-14T13:19:20.060", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}