CVE-2023-40550 Shim: out-of-bound read in verify_buffer_sbat()

What is CVE-2023-40550?

CVE-2023-40550 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

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

Weakness: CWE-125

Which versions are affected by CVE-2023-40550?

It affects 3 products.

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

How do I fix CVE-2023-40550?

Apply the vendor's patch.

Is CVE-2023-40550 being exploited?

There is no known exploitation of CVE-2023-40550 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-34094, AZL-34159, AZL-35257, AZL-35265, AZL-35277, BELL-CVE-2023-40550 and 3 more.