SB20260812428 - Always-Incorrect Control Flow Implementation in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-68118)

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

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper handling of reset packets in tcp_check_req() when processing in-window RST segments in the SYN-RECEIVED request-socket path. A remote attacker can send a specially crafted non-exact RST packet to cause a denial of service.

The issue affects connection handling before a connection is fully established.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/22cec809b048495310f206d9abbcdbbfbdce3ae3
• https://git.kernel.org/stable/c/234f9ffbd9b2c1b24ec67200ea3cff07401bec48
• https://git.kernel.org/stable/c/a28c4fcbf774e23b4779cae468e3497a5ad1f4a1