CVE-2025-0685

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2025
Source publication: Mar 3, 2025
Source updated: Oct 21, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

Grub2: jfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data

A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

grub2

Vendor: Unknown
Product: Unknown
Platforms: Unknown
Default status: unaffected
Package: grub2
Package collection: https://www.gnu.org/software/grub/

grub2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0	`affected`	semver	Unavailable	2.12	None listed