SecuriTricks - CVE-2025-61661

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.

Product(s) Impacted

Vendor	Product	Versions
Redhat	Grub	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-131

Incorrect Calculation of Buffer Size

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	redhat	grub	/	/	/	/	/	/	/	/

References

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

CVSS Score

4.8 / 10

CVSS Data - 3.1

Attack Vector: PHYSICAL
Attack Complexity: HIGH
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: LOW
Availability Impact: HIGH

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

View Vector String

Timeline

Published: Nov. 18, 2025, 7:15 p.m.
Last Modified: Nov. 19, 2025, 7:14 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

secalert@redhat.com

CVE-2025-61661