CVE-2022-48994 ALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event
A function prototype mismatch in the Linux kernel ALSA subsystem causes kernel panics when Clang's Control Flow Integrity is enabled.
- 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-2022-48994?
CVE-2022-48994 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 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:
ALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed.
seq_copy_in_user() and seq_copy_in_kernel() did not have prototypes matching snd_seq_dump_func_t. Adjust this and remove the casts. There are not resulting binary output differences.
This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches.
Which versions are affected by CVE-2022-48994?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48994?
Apply the vendor's patch.
Is CVE-2022-48994 being exploited?
There is no known exploitation of CVE-2022-48994 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48994, GHSA-5wgm-phpv-mgx7, UBUNTU-CVE-2022-48994.