CVE-2025-71082 Bluetooth: btusb: revert use of devm_kzalloc in btusb
A use-after-free vulnerability in the Linux kernel's Bluetooth USB driver allows attackers to cause denial of service or execute arbitrary code.
- 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-2025-71082?
CVE-2025-71082 is a high-severity use after free vulnerability in Linux kernel, published on 13 Jan 2026. 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: btusb: revert use of devm_kzalloc in btusb
This reverts commit 98921dbd00c4e ("Bluetooth: Use devm_kzalloc in btusb.c file").
In btusb_probe(), we use devm_kzalloc() to allocate the btusb data. This ties the lifetime of all the btusb data to the binding of a driver to one interface, INTF. In a driver that binds to other interfaces, ISOC and DIAG, this is an accident waiting to happen.
The issue is revealed in btusb_disconnect(), where calling usb_driver_release_interface(&btusb_driver, data->intf) will have devm free the data that is also being used by the other interfaces of the driver that may not be released yet.
To fix this, revert the use of devm and go back to freeing memory explicitly.
Weakness: CWE-416
Which versions are affected by CVE-2025-71082?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71082?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-71082 being exploited?
There is no known exploitation of CVE-2025-71082 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-71082, DEBIAN-CVE-2025-71082, GHSA-68q4-f7q5-5mv5, ROOT-OS-DEBIAN-11-CVE-2025-71082, ROOT-OS-UBUNTU-2204-CVE-2025-71082, ROOT-OS-UBUNTU-2404-CVE-2025-71082 and 1 more.