The Linux kernel's drm/msm/adreno driver for a2xx-a4xx GPUs contained a vulnerability where userspace could trigger a NULL pointer dereference by querying UBWC-related parameters, which are unsupported on these GPU generations. Although the driver does not fetch UBWC parameters for these older GPUs, it previously allowed queries for these parameters from userspace, causing a crash. The fix involves adding validation in the adreno_get_param() function to detect the absence of UBWC configuration and return safe default values, preventing the crash.

This vulnerability can cause a denial of service via a userspace-triggered crash of the kernel driver due to a NULL pointer dereference. There is no indication of privilege escalation or code execution. No known exploits in the wild have been reported.

A patch has been applied to the Linux kernel to fix this issue by adding proper checks in the adreno_get_param() function. Users should update to a kernel version that includes this fix. Since this is a kernel-level fix, upgrading the kernel is the recommended remediation.