Improper input validation in Linux kernel - CVE-2026-90086
Published: September 19, 2026
Vulnerability identifier: #VU151398
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-2026-90086
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause unintended processing of transmit metadata.
The vulnerability exists due to improper input validation in the AF_XDP zero-copy transmit metadata handling when submitting transmit descriptors with UMEM metadata space without the XDP_TX_METADATA option set. A local user can submit specially crafted transmit descriptors to cause unintended processing of transmit metadata.
The issue is limited to zero-copy transmission with UMEM metadata space.
Affected software
Linux kernel
How to mitigate CVE-2026-90086
Install security update from vendor's repository.