CVE-2021-4011 Memory corruption in xorg-x11-server
An out-of-bounds access in the X11 server allows attackers to compromise data confidentiality, integrity, and system availability.
- 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-2021-4011?
CVE-2021-4011 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 17 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Weakness: CWE-119
Which versions are affected by CVE-2021-4011?
It affects 3 products.
Linux distribution packages (2)
xorg-x11-server SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 7.4-27.122.46.1 |
xorg-x11-server SUSE:Linux Enterprise Server 11 SP4-LTSS | All versions | 7.4-27.122.46.1 |
Products include Debian Debian Linux, Fedoraproject Fedora, X.org X Server.
How do I fix CVE-2021-4011?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-4011 being exploited?
There is no known exploitation of CVE-2021-4011 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-4011, GHSA-pxmq-rrfv-xh8v, SUSE-SU-2021:14867-1, UBUNTU-CVE-2021-4011.