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CVE-2025-61661

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

Published: Nov 18, 2025Updated: Nov 19, 2025 Sources: CVE List NVD BDUCWE-131
NVD MITRE
4.8CVSSMEDIUM
EPSS Score
0.2%
Top 93.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:PAC:HPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:PAttack Vector
Physical
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-131

Affected Products

grub2GNUOSS Libraries
Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 7Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 9Red Hat
On-premOS
Operating Systems / linux-distro
gnuoss-projectUSOSS Librariesaka g. nu
red hatcommercialUSOperating Systemsaka red hat
and 6 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://access.redhat.com/security/cve/CVE-2025-61661
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2413827
bugzilla.redhat.com
https://access.redhat.com/security/cve/cve-2025-61661
access.redhat.com
and 6 more references View all →

Timeline

Published
Nov 18, 2025
Last Updated
Nov 19, 2025

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