Improper input validation in Linux kernel - CVE-2026-90146

Vulnerability identifier: #VU151338

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90146

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass XDP program attachment restrictions.

The vulnerability exists due to improper input validation in XDP link update handling when replacing an XDP program through BPF_LINK_UPDATE. A local user can create an XDP link with a normal program and replace it with an offloaded or device-bound program to bypass XDP program attachment restrictions.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.113-1

• https://git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f
• https://git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a
• https://git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9

• Improper input validation in Linux kernel core
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more