CVE-2026-89671High· 7.1▾ TwilightA flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally processes Access Control List (ACL) update requests, even when the client's request doe…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 9.1
none → critical
9.1 → 6.8
critical → medium
6.8 → 9.1
medium → critical
9.1 → 7
critical → high
0.2% → 0.5%
7 → 9.1
high → critical
Last analysed / modified upstream
9.1 → 7.1
critical → high
A flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (nfsd). The nfsd3_proc_setacl() function unconditionally processes Access Control List (ACL) update requests, even when the client's request does not specify an ACL to be set. A remote attacker could exploit this by sending a crafted SETACL request, leading to the unintended removal of a directory's default ACL or both access and default ACLs. This could result in unauthorized changes to file system permissions.
kernel: nfsd: gate nfs3 setacl by argp->mask — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-25.
Affected:
No fix planned:
Out of support scope
Workarounds / mitigations:
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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