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CVE-2025-61661

MEDIUM
Incorrect Calculation of Buffer Size (CWE-131)
2025-11-18 secalert@redhat.com
Denial Of Service
4.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
4.8 MEDIUM
AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
SUSE
MEDIUM
qualitative
Red Hat
4.8 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack Vector
Physical
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

3
Patch released
Apr 07, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 19:22 vuln.today
CVE Published
Nov 18, 2025 - 19:15 nvd
MEDIUM 4.8

DescriptionCVE.org

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.

AnalysisAI

A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. Rated medium severity (CVSS 4.8), this vulnerability is no authentication required. No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-131. 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.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Same weakness CWE-131 – Incorrect Calculation of Buffer Size

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/manager/5.0/x86_64/server:5.0.6.7.36.2 Affected
Container suse/multi-linux-manager/5.1/x86_64/server:5.1.1.1.8.10.2 Image server-image Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-4.14 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.53 Affected
Container suse/sle-micro-rancher/5.2:latest Affected
Container suse/sle-micro-rancher/5.3:latest Container suse/sle-micro-rancher/5.4:5.4.4.5.96 Image SLES15-SP4-BYOS-Azure Image SLES15-SP4-BYOS-GCE Image SLES15-SP4-HPC-BYOS-Azure Image SLES15-SP4-HPC-BYOS-GCE Image SLES15-SP4-HPC-GCE Image SLES15-SP4-Hardened-BYOS-Azure Image SLES15-SP4-Hardened-BYOS-GCE Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE Image SLES15-SP4-SAP-Azure Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Image SLES15-SP4-SAP-BYOS-Azure Image SLES15-SP4-SAP-BYOS-GCE Image SLES15-SP4-SAP-GCE Image SLES15-SP4-SAP-Hardened Image SLES15-SP4-SAP-Hardened-Azure Image SLES15-SP4-SAP-Hardened-BYOS-Azure Image SLES15-SP4-SAP-Hardened-BYOS-GCE Image SLES15-SP4-SAP-Hardened-GCE Image SLES15-SP4-SAPCAL-Azure Image SLES15-SP4-SAPCAL-GCE Affected

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CVE-2025-61661 vulnerability details – vuln.today
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