CVE-2023-2640 Privilege escalation in Ubuntu Kernel
An unprivileged user can bypass security checks to set privileged extended attributes on overlayfs files, potentially leading to privilege escalation.
- 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-2023-2640?
CVE-2023-2640 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 26 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.
Weakness: CWE-863
Which versions are affected by CVE-2023-2640?
It affects 1 product.
Products include Canonical Ubuntu Linux.
How do I fix CVE-2023-2640?
Apply the vendor's patch.
Is CVE-2023-2640 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-2640 exists.
Public exploit code: 1 Metasploit module and 10 proofs of concept on GitHub.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as GHSA-38f7-vv5r-859m, UBUNTU-CVE-2023-2640, USN-8255-2, USN-8255-3.