CVE-2023-52893 gsmi: fix null-deref in gsmi_get_variable
A null pointer dereference in the Linux kernel gsmi driver causes a system panic when accessing EFI variables without attributes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52893?
CVE-2023-52893 is a medium-severity vulnerability in Linux kernel, published on 21 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2023-52893?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52893?
Apply the vendor's patch.
Is CVE-2023-52893 being exploited?
There is no known exploitation of CVE-2023-52893 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52893, DEBIAN-CVE-2023-52893, GHSA-5c27-9gp6-68q5, UBUNTU-CVE-2023-52893.