CVE-2025-21937 Bluetooth: Add check for mgmt_alloc_skb() in mgmt_remote_name()
A missing null check in the Linux kernel Bluetooth subsystem allows attackers to cause a denial of service via null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-21937?
CVE-2025-21937 is a medium-severity vulnerability in Linux kernel, published on 1 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: Add check for mgmt_alloc_skb() in mgmt_remote_name()
Add check for the return value of mgmt_alloc_skb() in mgmt_remote_name() to prevent null pointer dereference.
Weakness: CWE-476
Which versions are affected by CVE-2025-21937?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21937?
Apply the vendor's patch.
Is CVE-2025-21937 being exploited?
There is no known exploitation of CVE-2025-21937 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-59915, BELL-CVE-2025-21937, DEBIAN-CVE-2025-21937, GHSA-66cx-2vhc-36f5, ROOT-OS-UBUNTU-2404-CVE-2025-21937, UBUNTU-CVE-2025-21937.