CVE-2020-27820 Use after free in kernel
A use-after-free in the Linux kernel's nouveau driver allows local attackers to potentially execute code or escalate privileges by unbinding the driver.
- 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-2020-27820?
CVE-2020-27820 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 2 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).
Weakness: CWE-416
Which versions are affected by CVE-2020-27820?
It affects 5 products.
Products include Fedoraproject Fedora, Linux kernel, Oracle Communications Cloud Native Core Binding Support Function, Oracle Communications Cloud Native Core Network Exposure Function, Oracle Communications Cloud Native Core Policy.
How do I fix CVE-2020-27820?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2020-27820 being exploited?
There is no known exploitation of CVE-2020-27820 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2020-27820, GHSA-gj7j-hrqm-6x5q, UBUNTU-CVE-2020-27820.