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Vulnerabilities CVE-2025-61661

CVE-2025-61661

Medium
Open
TLP:CLEAR

Grub2: grub2: out-of-bounds write via malicious usb device

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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.

Details

CVSS Score
4.8
CVSS Vector
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Confidence
90%
Published
Nov 18, 2025
Last Modified
Aug 21, 2026
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