CVE-2021-20320 Information disclosure in kernel
A local attacker with special privileges can bypass the eBPF verifier in the s390 Linux kernel JIT, leading to information disclosure.
- 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-2021-20320?
CVE-2021-20320 is a medium-severity vulnerability in Fedoraproject Fedora, published on 18 Feb 2022. 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 s390 eBPF JIT in bpf_jit_insn in arch/s390/net/bpf_jit_comp.c in the Linux kernel. In this flaw, a local attacker with special user privilege can circumvent the verifier and may lead to a confidentiality problem.
Weakness: CWE-200
Which versions are affected by CVE-2021-20320?
It affects 3 products.
Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.
How do I fix CVE-2021-20320?
Apply the vendor's patch.
Is CVE-2021-20320 being exploited?
There is no known exploitation of CVE-2021-20320 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2021-20320, GHSA-9q69-f33x-263w, UBUNTU-CVE-2021-20320.