Improper input validation in Linux kernel - CVE-2026-90051
Published: September 19, 2026
Vulnerability identifier: #VU151431
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90051
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger TCP transmission failures.
The vulnerability exists due to improper input validation in tcp_sendmsg_locked() when sending devmem TCP data without a valid zero-copy binding. A local user can submit a devmem TCP transmission that lacks a valid zero-copy binding to trigger TCP transmission failures.
The issue occurs when the network interface does not support scatter-gather I/O.
Affected software
Linux kernel
How to mitigate CVE-2026-90051
Install security update from vendor's repository.