CVE-2025-0690: Memory Corruption (CVSS 6.1)

Description

The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.

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CVSS v3.1 Score

6.1

MEDIUM

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

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

References

Other References

https://access.redhat.com/errata/RHSA-2025:6990 https://access.redhat.com/security/cve/CVE-2025-0690 https://bugzilla.redhat.com/show_bug.cgi?id=2346123 https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

Frequently Asked Questions

What is CVE-2025-0690? +

The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-0690? +

CVE-2025-0690 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-0690? +

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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