CVE-2025-0684: Grub2: reiserfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
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Description
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.
Classification
CVE ID: CVE-2025-0684
Problem Types
Out-of-bounds WriteAffected Products
Vendor: , Red Hat, Red Hat, Red Hat, Red Hat
Product: , Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 0.1187 (how common is this exploit)
EPSS Date: 2025-03-08 (when was this score calculated)