Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-72374

Vulnerability identifier: #VU143074

CSH Severity: Medium

CVSS v4: 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]

CVE-ID: CVE-2026-72374

CWE-ID: CWE-670

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• 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

• Always-Incorrect Control Flow Implementation in Linux kernel afs
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0