Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-53396
Published: July 21, 2026
Vulnerability identifier: #VU138873
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53396
CWE-ID: CWE-703
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper error handling in nfsd4_create_file() when processing OPEN(CREATE) requests with ACL attributes and an invalid filename. A remote attacker can send a specially crafted OPEN(CREATE) request to cause a denial of service.
The issue can be triggered repeatedly by supplying ACL attributes together with a filename longer than NAME_MAX.
Affected software
Linux kernel
How to mitigate CVE-2026-53396
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3