SB20260919163 - Improper input validation in Linux kernel ipv4
Published: September 19, 2026
Security Bulletin ID
SB20260919163
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-90051)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.