CVE-2024-45780: Grub2: fs/tar: integer overflow causes heap oob write

Severity: medium (CVSS 6.7 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-787

Description

A flaw was found in grub2. When reading tar files, grub2 allocates an internal buffer for the file name. However, it fails to properly verify the allocation against possible integer overflows. It's possible to cause the allocation length to overflow with a crafted tar file, leading to a heap out-of-bounds write. This flaw eventually allows an attacker to circumvent secure boot protections.

Affected products

grub2: through 2.12

References

https://access.redhat.com/security/cve/CVE-2024-45780
https://bugzilla.redhat.com/show_bug.cgi?id=2345856
https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

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