What’s Vulnerable › Vulnerabilities

CVE-2022-28737: There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-20 · updated 2026-06-17
• Weakness: CWE-787

Description

There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not discarded in such scenario.

Affected products

• Red Hat Bootloader Team shim: before 15.6 — fixed in 15.6

How to fix

Upgrade to a fixed version: Red Hat Bootloader Team shim 15.6. Check the vendor advisory for mitigations.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28737
• https://www.openwall.com/lists/oss-security/2022/06/07/5
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28737
• https://www.openwall.com/lists/oss-security/2022/06/07/5

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