CVE-2024-45779: Grub2: fs/bfs: integer overflow leads to heap oob read in the bfs parser

Severity: medium (CVSS 6.0 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: 2025-03-03 · updated 2026-10-21
Weakness: CWE-190

Description

An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirect extent map, grub2 fails to validate the number of extent entries to be read. A crafted or corrupted BFS filesystem may cause an integer overflow during the file reading, leading to a heap of bounds read. As a consequence, sensitive data may be leaked, or grub2 will crash.

Affected products

grub2: through 2.12

References

https://access.redhat.com/security/cve/CVE-2024-45779
https://bugzilla.redhat.com/show_bug.cgi?id=2345854
https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

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