Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-89693
Published: September 12, 2026
Vulnerability identifier: #VU149110
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89693
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to create objects without the requested access control lists.
The vulnerability exists due to improper handling of ACL translation errors in nfsd4_create() when processing NFSv4 CREATE requests containing ACLs. A remote attacker can submit a crafted NFSv4 CREATE request that causes ACL translation to fail to create objects without the requested access control lists.
Affected software
Linux kernel
How to mitigate CVE-2026-89693
Install security update from vendor's repository.