What’s Vulnerable › Vulnerabilities
CVE-2025-0678: Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-03-03 · updated 2026-10-21
- Weakness: CWE-190
Description
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Affected products
- grub2: through 2.12
- Red Hat Enterprise Linux: 7.0, 8.0, 9.0
- Red Hat OpenShift Container Platform 4.18: 4.0
References
- https://access.redhat.com/security/cve/CVE-2025-0678
- https://bugzilla.redhat.com/show_bug.cgi?id=2346118
- https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html
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