NULL pointer dereference in Linux kernel - CVE-2026-64049

Vulnerability identifier: #VU138590

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-2026-64049

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 a null pointer dereference in adreno_get_param() in the drm/msm/adreno driver when querying UBWC-related parameters on platforms without UBWC configuration. A local user can request UBWC-related parameters to cause a denial of service.

The issue affects a2xx through a4xx Adreno generations that do not support UBWC.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (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-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
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/22fc33d9b67694b24e0deb3f08c622464338cecb
• https://git.kernel.org/stable/c/2b4abf879360ea00a9e2b46d2d15dcdbc0687eed
• https://git.kernel.org/stable/c/eea43d5ed45089705bc5d70971c39076962d5951

• NULL pointer dereference in Linux kernel msm adreno driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia