Out-of-Bounds Write in Linux amdxdna Command Slot Handling

Executive Summary

This vulnerability exists in the Linux kernel's accel/amdxdna component. It involves an out-of-bounds write caused by the use of memset() on a command header before verifying that there is enough space in the command slot. Specifically, the remaining space in a command slot may be smaller than the size of the command header, so clearing the header with memset() without checking the size can overwrite memory beyond the intended boundary, leading to memory corruption.

The fix involved moving the memset() call to occur only after confirming that the slot has sufficient space, preventing the out-of-bounds write.

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Impact Analysis

This vulnerability can lead to memory corruption in the Linux kernel, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges if exploited.

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