Vulnerability CVE-2023-52893
Published: 2024-08-21

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 ("efi: pstore: Omit efivars caching EFI varstore
access layer") added a new get_variable call with attr=NULL, which
triggers panic in gsmi.

 References:
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
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