CVE-2024-36931 s390/cio: Ensure the copied buf is NUL terminated
A missing null termination in the s390/cio subsystem allows out-of-bounds reads, potentially disclosing kernel memory to local attackers.
- 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-2024-36931?
CVE-2024-36931 is a high-severity vulnerability in Linux kernel, published on 30 May 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:
s390/cio: Ensure the copied buf is NUL terminated
Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from userspace to that buffer. Later, we use scanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using scanf. Fix this issue by using memdup_user_nul instead.
Weakness: CWE-125
Which versions are affected by CVE-2024-36931?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-36931?
Apply the vendor's patch.
Is CVE-2024-36931 being exploited?
There is no known exploitation of CVE-2024-36931 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-36931, DEBIAN-CVE-2024-36931, UBUNTU-CVE-2024-36931.