CVE-2024-50102

In the Linux kernel, the following vulnerability has been resolved: x86: fix user address masking non-canonical speculation issue It turns out that AMD has a "Meltdown Lite(tm)" issue with non-canonical accesses in kernel space. And so using just the high bit to decide whether an access is in user space or kernel space ends up with the good old "leak speculative data" if you have the right gadget using the result: CVE-2020-12965 “Transient Execution of Non-Canonical Accesses“ Now, the kernel surrounds the access with a STAC/CLAC pair, and those instructions end up serializing execution on older Zen architectures, which closes the speculation window. But that was true only up until Zen 5, which renames the AC bit [1]. That improves performance of STAC/CLAC a lot, but also means that the speculation window is now open. Note that this affects not just the new address masking, but also the regular valid_user_address() check used by access_ok(), and the asm version of the sign bit check in the get_user() helpers. It does not affect put_user() or clear_user() variants, since there's no speculative result to be used in a gadget for those operations.

The following products are affected by CVE-2024-50102 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-50102.

URL	Resource
https://git.kernel.org/stable/c/291313693677a345d4f50aae3c68e28b469f601e
https://git.kernel.org/stable/c/86e6b1547b3d013bc392adf775b89318441403c2
https://lore.kernel.org/linux-cve-announce/2024110553-CVE-2024-50102-3d1e@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-50102
https://www.cve.org/CVERecord?id=CVE-2024-50102