CVE-2025-39750 wifi: ath12k: Correct tid cleanup when tid setup fails
A flaw in the ath12k WiFi driver causes out-of-bounds access when TID setup fails, potentially leading to a system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-39750?
CVE-2025-39750 is a high-severity memory corruption vulnerability in Linux kernel, published on 11 Sep 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:
wifi: ath12k: Correct tid cleanup when tid setup fails
Currently, if any error occurs during ath12k_dp_rx_peer_tid_setup(), the tid value is already incremented, even though the corresponding TID is not actually allocated. Proceed to ath12k_dp_rx_peer_tid_delete() starting from unallocated tid, which might leads to freeing unallocated TID and cause potential crash or out-of-bounds access.
Hence, fix by correctly decrementing tid before cleanup to match only the successfully allocated TIDs.
Also, remove tid-- from failure case of ath12k_dp_rx_peer_frag_setup(), as decrementing the tid before cleanup in loop will take care of this.
Compile tested only.
Weakness: CWE-125
Which versions are affected by CVE-2025-39750?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-39750?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-39750 being exploited?
There is no known exploitation of CVE-2025-39750 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-39750, DEBIAN-CVE-2025-39750, GHSA-q522-2v7v-4rm7, ROOT-OS-DEBIAN-11-CVE-2025-39750, ROOT-OS-DEBIAN-12-CVE-2025-39750, ROOT-OS-UBUNTU-2204-CVE-2025-39750 and 2 more.