CVE-2025-0690
Grub2: read: integer overflow may lead to out-of-bounds write
- Published
- Feb 24, 2025
- Updated
- Jul 8, 2026
- Assigning CNA
- redhat
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 51.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- CVE-2025-0690Informational
Technical analysis of CVE-2025-0690: integer overflow in GRUB2's read command leading to heap out-of-bounds write, arbitrary code execution, and Secure Boot bypass. Includes root cause, CVSS metrics, and vendor patch guidance.
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