CVE-2025-0689: grub2 Buffer Overflow — Fix

Description

When reading data from disk, the grub's UDF filesystem module utilizes the user controlled data length metadata to allocate its internal buffers. In certain scenarios, while iterating through disk sectors, it assumes the read size from the disk is always smaller than the allocated buffer size which is not guaranteed. A crafted filesystem image may lead to a heap-based buffer overflow resulting in critical data to be corrupted, resulting in the risk of arbitrary code execution by-passing secure boot protections.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-120 CWE-120

Affected Products

Vendor	Product	Versions
gnu	grub2	< 2.12

References

Advisories & Patches

https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

Other References

https://access.redhat.com/security/cve/CVE-2025-0689 https://bugzilla.redhat.com/show_bug.cgi?id=2346122

Frequently Asked Questions

What is CVE-2025-0689? +

When reading data from disk, the grub's UDF filesystem module utilizes the user controlled data length metadata to allocate its internal buffers. In certain scenarios, while iterating through disk sectors, it assumes the read size from the disk is always smaller than the allocated buffer size which is not guaranteed. A crafted filesystem image may lead to a heap-based buffer overflow resulting in critical data to be corrupted, resulting in the risk of arbitrary code execution by-passing secure boot protections. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-0689? +

CVE-2025-0689 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-0689? +

CVE-2025-0689 affects products from gnu, specifically: grub2. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-0689? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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