CVE-2023-40549: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and crashing Shim, resulting in a denial of service.

Affected products

• Fedoraproject Fedora: version 39 only
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only
• Red Hat Shim: before 15.8 (fixed in 15.8)

Published 2024-01-29. Last modified 2026-06-17.