SB2026072149 - Improper Check or Handling of Exceptional Conditions in Linux kernel nfsd

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-53396)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/18cf006a08babec0bbac2a3784f8f28e56e47490
• https://git.kernel.org/stable/c/24c975bbdd564d7d0ad90294bfa69729830345de