CVE-2023-53474

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the x86/MCE/AMD code where the bank map variable, used to track initialized Machine Check Architecture (MCA) banks, is of type unsigned int. This can lead to a shift-out-of-bounds error when the number of MCA banks exceeds 32, triggering a UBSAN (Undefined Behavior Sanitizer) complaint. The issue arises because the maximum number of MCA banks is 64, but the bank map variable cannot represent values beyond 31. The fix involves changing the bank map to an u64 type and using the BIT ULL() macro for bit manipulation.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.