CVE-2025-54770: Grub2: use-after-free in net_set_vlan
A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the netsetvlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid.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
Other sources
The netsetvlan command is registered in the net module during load. However, the command is not unregistered at the module unload. So, this may lead to use-after-free issue when the netsetvlan command is invoked after the net module unload.
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-54770?
CVE-2025-54770 is classified as a high severity vulnerability due to its potential for causing a Denial of Service (DoS).
How do I fix CVE-2025-54770?
To fix CVE-2025-54770, update the GRUB2 bootloader to the latest version that addresses this specific vulnerability.
What causes CVE-2025-54770?
CVE-2025-54770 is caused by a Use-after-Free issue within the network module of the GRUB2 bootloader.
Which systems are affected by CVE-2025-54770?
CVE-2025-54770 affects systems running the GNU GRUB2 bootloader.
What impact does CVE-2025-54770 have on users?
The impact of CVE-2025-54770 is primarily Denial of Service, which can render the system unbootable.