SB20260507149 - Always-Incorrect Control Flow Implementation in Linux kernel core

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Main Vulnerability Database SB20260507149

SB20260507149 - Always-Incorrect Control Flow Implementation in Linux kernel core

Published: May 7, 2026

Security Bulletin ID SB20260507149
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-43194)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of transmit error return codes in tcp_write_xmit() when processing GSO frames on qdisc-less network devices. A local user can trigger packet drops on a veth-based setup to cause a denial of service.

The issue occurs in configurations using qdisc-less devices, such as veth with TSO disabled and NAPI enabled, where loss of a single segment in a GSO super frame can be treated as loss of the entire frame and leave a TCP connection stuck.


Remediation

Install update from vendor's website.

References