CVE-2024-50102

Summary

CVE-2024-50102 is a recently identified vulnerability in the Linux kernel that affects AMD processors. The issue stems from a "Meltdown Lite(tm)" problem with non-canonical accesses in kernel space. Previously, the Linux kernel used STAC/CLAC pairs to close the speculation window, but with the renaming of the AC bit in Zen 5, this approach no longer works, reopening the speculation window. The vulnerability impacts not only the new address masking, but also the regular valid_user_address() check and the asm version of the sign bit check in get_user() helpers. However, put_user() and clear_user() variants remain unaffected, as they do not involve speculative results for gadget use.

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