CVE-2025-61661
Grub2: grub2: out-of-bounds write via malicious usb device
- State
- Published
- Severity
- 4.8 Medium
- Published
- Nov 18, 2025
- Updated
- Sep 1, 2026
- Reserved
- Sep 29, 2025
Description
A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.8 Medium | CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H | redhat |
Weaknesses
- CWE-131 Incorrect Calculation of Buffer Size
Affected Products
| Product | Versions |
|---|---|
grub2GNU |
|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat |
References
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.