CVE-2022-49359: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-49359 affects the Linux kernel's drm/panfrost driver. The vulnerability was discovered when it was found that a Memory Management Unit (MMU) context could outlive its corresponding panfrostpriv, while the job structure still referenced panfrostpriv to get hold of the MMU context. This created a use-after-free condition that could be triggered, resulting in system instability (Kernel Git).

The vulnerability exists in the panfrost driver's job handling mechanism where the job structure maintained a reference to panfrostpriv instead of directly referencing the MMU structure. When panfrostpriv was freed while the MMU context was still active, it led to a use-after-free condition. The issue was fixed by dropping the reference to panfrost_priv in the job structure and adding a direct reference to the MMU structure. The vulnerability has been assigned a CVSS v3.1 Base Score of 7.8 (HIGH) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability could lead to system instability and potential privilege escalation due to the use-after-free condition in the kernel's GPU driver. When exploited, it could allow an attacker with local access to cause system crashes or potentially execute arbitrary code with elevated privileges (NVD).

The vulnerability has been patched in the Linux kernel by modifying the panfrost driver to directly reference the MMU structure instead of accessing it through panfrostpriv. Users should update their systems to a patched kernel version. The fix involves changes to multiple files including panfrostdrv.c, panfrostjob.c, and panfrostjob.h (Kernel Git).