CVE-2025-39971 i40e: fix idx validation in config queues msg
A missing index validation in the i40e network driver allows attackers to trigger a null pointer dereference, causing a system crash.
- 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-2025-39971?
CVE-2025-39971 is a high-severity vulnerability in Linux, published on 15 Oct 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:
i40e: fix idx validation in config queues msg
Ensure idx is within range of active/initialized TCs when iterating over vf->ch[idx] in i40e_vc_config_queues_msg().
Which versions are affected by CVE-2025-39971?
How do I fix CVE-2025-39971?
Apply the vendor's patch.
Is CVE-2025-39971 being exploited?
There is no known exploitation of CVE-2025-39971 in the wild and no public exploit code.
Sources
Also known as AZL-68480, BELL-CVE-2025-39971, DEBIAN-CVE-2025-39971, GHSA-h9cj-j3jc-97wc, ROOT-OS-DEBIAN-11-CVE-2025-39971, ROOT-OS-DEBIAN-12-CVE-2025-39971 and 3 more.