Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Grub2 | <= 2.12 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2025-0685Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2346120Issue Tracking
FAQ
What is CVE-2025-0685?
CVE-2025-0685 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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, how...
How severe is CVE-2025-0685?
CVE-2025-0685 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-0685?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Grub2.