CVE-2023-52893 Information

Description

In the Linux kernel the following vulnerability has been resolved:

gsmi: fix null-deref in gsmi_get_variable

We can get EFI variables without fetching the attribute so we must allow for that in gsmi.

commit 859748255b43 (fi: pstore: Omit efivars caching EFI varstore access layer) added a new get_variable call with attr=NULL which triggers panic in gsmi.

Reference

https://git.kernel.org/stable/c/ee5763ef829bd923033510de6d1df7c73f085e4b https://git.kernel.org/stable/c/32313c11bdc8a02c577abaf865be3664ab30410a https://git.kernel.org/stable/c/ffef77794fb5f1245c3249b86342bad2299accb5 https://git.kernel.org/stable/c/ae2a9dcc8caa60b1e14671294e5ec902ea5d1dfd https://git.kernel.org/stable/c/eb0421d90f916dffe96b4c049ddf01c0c50620d2 https://git.kernel.org/stable/c/6646d769fdb0ce4318ef9afd127f8526d1ca8393 https://git.kernel.org/stable/c/a769b05eeed7accc4019a1ed9799dd72067f1ce8