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Vulnerability · Published Nov 18, 2025 · Assigned by redhat

CVE-2025-61663Grub2: missing unregister call for normal commands may lead to use-after-free

Medium 4.9

In plain English

A medium-severity security flaw in grub2 from GNU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.9Medium
Exploit odds (30 days)0.1%top 96.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 An attacker who can execute this command can force the system to access memory locations that are no longer valid.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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12grub2no fix listedDEBIAN-CVE-2025-61663
Debian:13grub2no fix listedDEBIAN-CVE-2025-61663
Debian:14grub22.14-1DEBIAN-CVE-2025-61663
Ubuntu:22.04:LTSgrub2-signedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:24.04:LTSgrub2-signedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:25.10grub2-signedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:26.04:LTSgrub2-signedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:26.10grub2-signedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:22.04:LTSgrub2-unsignedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:24.04:LTSgrub2-unsignedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:25.10grub2-unsignedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:26.04:LTSgrub2-unsignedno fix listedUBUNTU-CVE-2025-61663
Ubuntu:26.10grub2-unsignedno fix listedUBUNTU-CVE-2025-61663

Affected products (as reported)

VendorProductVersions
GNU grub2 0 – through 2.14
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-825 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References