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.
References
| Link | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2025-0684 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2346119 | Issue Tracking |
Configurations
History
28 Jul 2025, 17:22
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Gnu grub2
Gnu |
|
| CWE | ||
| CPE | cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* | |
| References | () https://bugzilla.redhat.com/show_bug.cgi?id=2346119 - Issue Tracking | |
| References | () https://access.redhat.com/security/cve/CVE-2025-0684 - Third Party Advisory |
03 Mar 2025, 18:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-03-03 18:15
Updated : 2025-07-28 17:22
NVD link : CVE-2025-0684
Mitre link : CVE-2025-0684
JSON object : View
Products Affected
gnu
- grub2
CWE
No CWE.