CVE-2026-89671High· 7.0▾ 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 38.5 · likelihood 0.1 · exploitation 0
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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%
— → 6.8
none → medium
0.2% → 0.5%
— → 6.8
none → medium
— → 9.1
none → critical
9.1 → 6.8
critical → medium
6.8 → 9.1
medium → critical
Last analysed / modified upstream
9.1 → 7
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 2026-09-21.
Affected:
No fix planned:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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