CVE-2026-68479 Bluetooth: btrtl: validate firmware patch bounds
An integer underflow in the Linux kernel Bluetooth driver allows oversized memory reads and writes during firmware parsing, potentially leading to code execution or crashes.
- 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-2026-68479?
CVE-2026-68479 is a high-severity vulnerability in Linux, published on 15 Aug 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: btrtl: validate firmware patch bounds
rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the firmware version. A malformed firmware patch shorter than the version field can make this subtraction underflow and turn the copy into an oversized read and write during Bluetooth setup.
The existing patch_offset + patch_length check can also wrap on 32-bit architectures. Validate the patch length and range without arithmetic overflow before allocating or copying the patch.
Weakness: CWE-190
Which versions are affected by CVE-2026-68479?
How do I fix CVE-2026-68479?
Apply the vendor's patch.
Is CVE-2026-68479 being exploited?
There is no known exploitation of CVE-2026-68479 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68479, DEBIAN-CVE-2026-68479, GHSA-2gq6-hg5j-367v, UBUNTU-CVE-2026-68479.