CVE-2021-33656 Memory corruption in openEuler:kernel
A local attacker can trigger an out-of-bounds write in the kernel via a malicious ioctl command, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-33656?
CVE-2021-33656 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 18 Jul 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
Weakness: CWE-787
Which versions are affected by CVE-2021-33656?
It affects 3 products.
Products include Debian Debian Linux, Linux kernel, Openatom Openeuler.
How do I fix CVE-2021-33656?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-33656 being exploited?
There is no known exploitation of CVE-2021-33656 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-33656, GHSA-9p9r-j677-3r3q, OESA-2022-1748, UBUNTU-CVE-2021-33656, USN-5591-1, USN-5591-2 and 4 more.