CVE-2023-40551 Shim: out of bounds read when parsing mz binaries

What is CVE-2023-40551?

CVE-2023-40551 is a medium-severity vulnerability in Fedoraproject Fedora, published on 29 Jan 2024. 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 MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system's boot phase.

Weakness: CWE-125

Which versions are affected by CVE-2023-40551?

It affects 3 products.

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

How do I fix CVE-2023-40551?

Apply the vendor's patch.

Is CVE-2023-40551 being exploited?

There is no known exploitation of CVE-2023-40551 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 AZL-34160, AZL-35258, BELL-CVE-2023-40551, DEBIAN-CVE-2023-40551, GHSA-6j62-7qgg-9gww, UBUNTU-CVE-2023-40551.