CVE-2021-20239 Information disclosure in kernel

What is CVE-2021-20239?

CVE-2021-20239 is a low-severity vulnerability in Fedoraproject Fedora, published on 28 May 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 the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

Weakness: CWE-119, CWE-822

Which versions are affected by CVE-2021-20239?

It affects 3 products.

Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2021-20239?

Apply the vendor's patch.

Is CVE-2021-20239 being exploited?

There is no known exploitation of CVE-2021-20239 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-20239, GHSA-r3jm-2397-mvmw, UBUNTU-CVE-2021-20239.