Improper Initialization in Linux kernel - CVE-2026-72133

Vulnerability identifier: #VU143463

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72133

CWE-ID: CWE-665

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper initialization in the spi-uniphier driver interrupt handling logic when registering an interrupt handler before initializing the associated completion. A local attacker can trigger an interrupt during driver initialization to cause a denial of service.

This may lead to complete() being called on an uninitialized completion, resulting in undefined behavior.

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/077a7bc1c32d3da9670c5e282ea3e5ac8a94be59
• https://git.kernel.org/stable/c/49f6705d80b5e6175d8435d9c72b66bd516a8e89
• https://git.kernel.org/stable/c/82a5746c4c9e94f6f816ec7edea6ddc24417c6a5
• https://git.kernel.org/stable/c/8b5798ce0007874c14611b8ee4ce6c749855260e
• https://git.kernel.org/stable/c/b9fcf0db433d79648ace74bc2b8b88f91e306304
• https://git.kernel.org/stable/c/d44b828eb551bd59ba9f22457825cc3db3a39fc1
• https://git.kernel.org/stable/c/f3ad1c87d8201e54b66bd6072442f0b5d5a308ee
• https://git.kernel.org/stable/c/f4bb0a91f7badd6d15ac8d783a1169d9e1e95c17

• Improper Initialization in Linux kernel spi driver
• 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