CVE-2025-61663
published 2025-11-18CVE-2025-61663: 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…
PriorityP427medium4.9CVSS 3.1
AVLACHPRNUINSUCLILAL
EPSS
0.13%
2.7th percentile
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 An attacker who can execute this command can force the system to access memory locations that are no longer valid.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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | grub2 | < grub2 2.14-1 (sid) | grub2 2.14-1 (sid) |
| gnu | grub2 | <= 2.14 | — |
| msrc | azl3_grub2_2.06-25_on_azure_linux_3.0 | — | — |
| msrc | azl3_grub2_2.06-26_on_azure_linux_3.0 | — | — |
| msrc | cbl2_grub2_2.06-15_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_grub2_2.06-16_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.14.9MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
osv4.9MEDIUM
vendor_debian4.9MEDIUM
vendor_msrc4.9MEDIUM
vendor_redhat4.9MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-jf88-7285-jch4: A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk
ghsa_unreviewed·2025-11-18
CVE-2025-61663 [MEDIUM] CWE-825 GHSA-jf88-7285-jch4: A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk
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 An attacker who can execute this command can force the system to access memory locations that are no longer valid.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.
OSV
CVE-2025-61663: A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk
osv·2025-11-18·CVSS 4.9
CVE-2025-61663 [MEDIUM] CVE-2025-61663: A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk
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.
Red Hat
grub2: Missing unregister call for normal commands may lead to use-after-free
vendor_redhat·2025-11-18·CVSS 4.9
CVE-2025-61663 [MEDIUM] CWE-825 grub2: Missing unregister call for normal commands may lead to use-after-free
grub2: Missing unregister call for normal commands may lead to use-after-free
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.
A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is
Microsoft
Grub2: missing unregister call for normal commands may lead to use-after-free
vendor_msrc·2025-11-11·CVSS 4.9
CVE-2025-61663 [MEDIUM] CWE-825 Grub2: missing unregister call for normal commands may lead to use-after-free
Grub2: missing unregister call for normal commands may lead to use-after-free
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade
Debian
CVE-2025-61663: grub2 - A vulnerability has been identified in the GRUB2 bootloader's normal command tha...
vendor_debian·2025·CVSS 4.9
CVE-2025-61663 [MEDIUM] CVE-2025-61663: grub2 - A vulnerability has been identified in the GRUB2 bootloader's normal command tha...
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.
Scope: local
bookworm: open
bullseye: open
forky: open
sid: resolved (fixed in 2.14-1)
trixie: open
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-11-18
Published