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Vulnerability DatabaseCVE-2022-49488
CVE-2022-49488:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49488 affects the Linux kernel's drm/msm/mdp5 component. The vulnerability was discovered when mdp5getglobalstate could return -EDEADLK when acquiring the modeset lock, but the globalstate in mdp5mixerrelease didn't check for returned errors. This could lead to a NULL dereference error (Kernel Git).
Technical details
The vulnerability exists in the mdp5mixerrelease function where it fails to properly check the return value from mdp5getglobalstate. When acquiring the modeset lock, mdp5getglobalstate can return -EDEADLK, but the code proceeds to use the global_state without verifying if an error was returned, potentially leading to a NULL pointer dereference (Kernel Git).
Impact
If exploited, this vulnerability could lead to a NULL pointer dereference in the kernel, potentially causing system crashes or denial of service conditions (Kernel Git).
Mitigation and workarounds
The issue has been fixed by modifying mdp5mixerrelease to check for and properly handle error returns from mdp5getglobal_state. The fix includes propagating the error code when a deadlock is detected. Users should update to a patched version of the kernel that includes commit ca75f6f7c6f89365e40f10f641b15981b1f07c31 (Kernel Git).
Additional resources
Source: This report was generated using AI
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