CVE-2021-46976

Summary

CVE-2021-46976 is a vulnerability affecting the Linux kernel's i915 graphics driver. The issue lies in the auto_retire function where the retire logic uses the lower bits of the pointer to store flags, but the auto_retire function is not guaranteed to be aligned to a multiple of 4. This misalignment results in crashes as the system jumps to the wrong address, leading to an invalid opcode error. The vulnerability was first identified on a Google Volteer2 system and could potentially impact other systems using unaligned pointers in similar contexts.

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