CVE-2026-89671 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability in nfsd3_proc_setacl where ACL mask bits are not checked before setting ACLs, letting remote attackers unintentionally remove ACLs, exploit requires crafted NFSv3 SETACL request.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.50% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for nfsd3_proc_setacl.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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