Vulnerability Details CVE-2025-0684
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs 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_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.6%
CVSS Severity
CVSS v3 Score 6.4
References
Products affected by CVE-2025-0684
-
cpe:2.3:a:gnu:grub2:-
-
cpe:2.3:a:gnu:grub2:1.98
-
cpe:2.3:a:gnu:grub2:1.99
-
cpe:2.3:a:gnu:grub2:2.00
-
cpe:2.3:a:gnu:grub2:2.01
-
cpe:2.3:a:gnu:grub2:2.02
-
cpe:2.3:a:gnu:grub2:2.04
-
cpe:2.3:a:gnu:grub2:2.06
-
cpe:2.3:a:gnu:grub2:2.06-150400.7.1
-
cpe:2.3:a:gnu:grub2:2.06-18.1
-
cpe:2.3:a:gnu:grub2:2.12