NULL pointer dereference in Linux kernel - CVE-2026-64227

Vulnerability identifier: #VU139777

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-2026-64227

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper handling of a NULL pointer in ACPI platform driver probe handlers when probing a platform device without an ACPI companion object. A local user can force a platform driver to match a device that does not match its device ID list to cause a denial of service.

The issue affects core ACPI-related platform drivers and can be triggered through driver override behavior.

Linux kernel
Debian Linux
Ubuntu
linux (Debian package)
linux-aws (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/34f4d0e4e5065237d15651df759a99e81b7f9f51
• https://git.kernel.org/stable/c/612ddab8fce04394bd7aebe8e0f2599642e30859
• https://git.kernel.org/stable/c/a9451bf561232314755baf69a5916e0ac77f33fc
• https://git.kernel.org/stable/c/e4865a56d013e86e46ea6acea15bb6eae01898ff
• https://git.kernel.org/stable/c/f1e12d81f9cd250e722da01c7670b518d4181406

• NULL pointer dereference in Linux kernel acpi driver
• Ubuntu update for linux-aws
• Debian update for linux
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-gcp-7.0