GNU grub2 expired pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in GNU grub2. Affected is an unknown function. The manipulation leads to expired pointer dereference. This vulnerability is uniquely identified as CVE-2025-61663. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in GNU grub2 (affected version unknown). It has been rated as problematic. This issue affects an unknown functionality. The manipulation with an unknown input leads to a expired pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-825. The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2025-61663 since 09/29/2025. The exploitation is known to be difficult. An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 275739 (Linux Distros Unpatched Vulnerability : CVE-2025-61663), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (275739), EUVD (EUVD-2025-198080) and CERT Bund (WID-SEC-2025-2638). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Grub
  • Red Hat OpenShift

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.5
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.9
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Expired pointer dereference
CWE: CWE-825
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 275739
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-61663

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/29/2025 CVE reserved
11/18/2025 +50 days Advisory disclosed
11/18/2025 +0 days VulDB entry created
04/09/2026 +142 days VulDB entry last update

Sourcesinfo

Vendor: gnu.org

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2025-61663 (🔒)
GCVE (CVE): GCVE-0-2025-61663
GCVE (VulDB): GCVE-100-332837
EUVD: 🔒
CERT Bund: WID-SEC-2025-2638 - Grub: Mehrere Schwachstellen

Entryinfo

Created: 11/18/2025 20:18
Updated: 04/09/2026 17:09
Changes: 11/18/2025 20:18 (59), 11/20/2025 14:04 (2), 11/21/2025 00:55 (7), 12/19/2025 18:52 (1), 12/21/2025 06:25 (1), 01/06/2026 21:36 (1), 03/19/2026 00:33 (1), 04/09/2026 17:09 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!