SB20260815199 - Race condition in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74268)

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

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper state management in tcp_set_state() and tcp_call_bpf() when force-closing a child socket whose inherited sock_ops callback flags remain set after setup failure. A remote attacker can send network traffic that triggers child socket setup failure to cause a denial of service.

The issue occurs before the child socket is ever established and affects forced-close paths that reach tcp_done() without the expected socket lock.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92
• https://git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b
• https://git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae