Improper input validation in Linux kernel - CVE-2026-45952
Published: May 28, 2026
Vulnerability identifier: #VU132541
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-45952
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-45952
Install security update from vendor's repository.