CVE-2025-0684: Grub2: reiserfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading data
First published: Mon Feb 17 2025(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Ubuntu GRUB (GNU GRand Unified Bootloader) |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-0684?
CVE-2025-0684 has a high severity rating due to its potential for exploitation through integer overflow vulnerabilities.
How do I fix CVE-2025-0684?
Fixing CVE-2025-0684 involves updating the GRUB package to the latest version provided by your operating system vendor.
What systems are affected by CVE-2025-0684?
CVE-2025-0684 affects systems using the GRUB bootloader that employ a reiserfs filesystem.
What types of attacks can CVE-2025-0684 enable?
CVE-2025-0684 can enable attackers to perform arbitrary code execution due to its integer overflow vulnerability.
Is there a workaround for CVE-2025-0684 if I cannot apply a patch right away?
A potential workaround for CVE-2025-0684 is to avoid using reiserfs filesystems until the vulnerability is mitigated.
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