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.
History

Wed, 19 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
Title Grub2: out-of-bounds write Grub2: grub2: out-of-bounds write via malicious usb device

Wed, 19 Nov 2025 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 19 Nov 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 18 Nov 2025 22:30:00 +0000

Type Values Removed Values Added
References

Tue, 18 Nov 2025 18:30:00 +0000

Type Values Removed Values Added
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.
Title Grub2: out-of-bounds write
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-131
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2025-11-18T18:20:42.151Z

Updated: 2025-11-19T20:14:18.041Z

Reserved: 2025-09-29T20:18:48.974Z

Link: CVE-2025-61661

cve-icon Vulnrichment

Updated: 2025-11-19T14:18:09.716Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-18T19:15:49.973

Modified: 2025-11-19T19:14:59.327

Link: CVE-2025-61661

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-11-18T00:00:00Z

Links: CVE-2025-61661 - Bugzilla