SB2026081612 - Always-Incorrect Control Flow Implementation in Linux kernel afs

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-72374)

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

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 handling of incomplete message parsing state in afs callback service message parsers when processing callback notification request streams. A remote attacker can send crafted callback messages with incomplete packet sequences to cause a denial of service.

The issue affects the AFS filesystem client callback service that listens through an rxrpc server for callback notifications.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de
• https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4
• https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231
• https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6
• https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae
• https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4
• https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4
• https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b