CVE-2025-21749 net: rose: lock the socket in rose_bind()
A race condition in the Linux kernel's ROSE protocol allows local attackers to cause a soft lockup and denial of service by triggering concurrent bind operations.
- 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-2025-21749?
CVE-2025-21749 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 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:
net: rose: lock the socket in rose_bind()
syzbot reported a soft lockup in rose_loopback_timer(), with a repro calling bind() from multiple threads.
rose_bind() must lock the socket to avoid this issue.
Weakness: CWE-667
Which versions are affected by CVE-2025-21749?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21749?
Apply the vendor's patch.
Is CVE-2025-21749 being exploited?
There is no known exploitation of CVE-2025-21749 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-57826, BELL-CVE-2025-21749, DEBIAN-CVE-2025-21749, GHSA-8pq8-wmv3-g27x, ROOT-OS-UBUNTU-2404-CVE-2025-21749, UBUNTU-CVE-2025-21749.