SB20260507153 - Race condition in Linux kernel smc

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-43198)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a race condition in tcp_v6_syn_recv_sock() when handling IPv6 TCP connection requests. A remote attacker can send network traffic that triggers the race to cause a denial of service.

The issue occurs because a child socket may become visible in the TCP ehash table before its IPv6 state is fully initialized.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b
• https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae
• https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd