CVE-2025-38315 Bluetooth: btintel: Check dsbr size from EFI variable
A stack buffer overflow in the Linux kernel Bluetooth driver allows local attackers to execute arbitrary code or escalate privileges via a malformed EFI variable.
- 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-2025-38315?
CVE-2025-38315 is a medium-severity memory corruption vulnerability in Linux kernel, published on 10 Jul 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: btintel: Check dsbr size from EFI variable
Since the size of struct btintel_dsbr is already known, we can just start there instead of querying the EFI variable size. If the final result doesn't match what we expect also fail. This fixes a stack buffer overflow when the EFI variable is larger than struct btintel_dsbr.
Weakness: CWE-674
Which versions are affected by CVE-2025-38315?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38315?
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-2025-38315 being exploited?
There is no known exploitation of CVE-2025-38315 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-38315, DEBIAN-CVE-2025-38315, GHSA-p9j8-pxcr-cq49, UBUNTU-CVE-2025-38315.