SB20260528129 - Improper input validation in Linux kernel meta fbnic driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-45952)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the fbnic driver when processing oversized non-TCP packets after the MTU is increased beyond the HDS threshold with a single-buffer XDP program attached. A remote attacker can send oversized packets to cause a denial of service.

The issue occurs when a single-buffer XDP program is attached and the MTU has been increased beyond the HDS threshold.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df
• https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df
• https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e