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CVE-2025-61661

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Date: November 18, 2025

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.

Severity Score

Related Resources (5)

https://access.redhat.com/security/cve/CVE-2025-61661
https://bugzilla.redhat.com/show_bug.cgi?id=2413827
http://www.openwall.com/lists/oss-security/2025/11/18/8
https://nvd.nist.gov/vuln/detail/CVE-2025-61661
https://www.mend.io/vulnerability-database/CVE-2025-61661

Severity Score

Weakness Type (CWE)

Incorrect Calculation of Buffer Size

CWE-131

CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): HIGH

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