Linux Kernel DRM/Radeon Integer Overflow Vulnerability in Command Stream Parser

An integer overflow vulnerability has been identified in the Linux kernel's DRM/Radeon graphics driver. This issue arises in the command stream parser initialization function, where an unsigned size variable can overflow if it reaches a certain value. Specifically, when the size is 0x40000000, multiplying it by the size of a uint32_t results in zero, leading to an integer overflow. This overflow causes the function to reference uninitialized memory, which can create potential security risks.

Impact

Exploitation of this vulnerability could lead to the use of uninitialized memory, which may cause undefined behavior in the application, including potential memory corruption or disclosure of sensitive information.

Reproduction

The vulnerability can be reproduced by modifying the Radeon command stream parser initialization to use a size value of 0x40000000. This can be done by creating a custom command stream that simulates this condition and then initializing the parser with it. The resulting behavior will demonstrate the integer overflow and its consequences.

Remediation

Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched. The specific commit that addresses this issue is available in the Linux kernel stable tree.