CVE-2023-4693: GNU GRUB2

Medium severity, CVSS 4.6. EPSS: 0.5% chance of exploitation in the next 30 days.

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

Affected products

• GNU GRUB2: before 2.12 (fixed in 2.12)
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2023-10-25. Last modified 2026-07-21.