CVE-2026-68365 USB: serial: io_edgeport: cap received transmit credits
A malicious USB device can trigger an out-of-bounds write in the Linux kernel io_edgeport driver, potentially leading to code execution or 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-2026-68365?
CVE-2026-68365 is a memory corruption vulnerability in Linux, published on 10 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:
USB: serial: io_edgeport: cap received transmit credits
The interrupt-status packet reports transmit credits returned by the device. edge_interrupt_callback() adds the 16-bit value to txCredits without checking maxTxCredits.
edge_write() uses txCredits minus the software FIFO count as the amount of data that fits. Since the FIFO is allocated with maxTxCredits bytes, txCredits exceeding maxTxCredits can cause OOB write in ring buffer.
Cap accumulated credits at maxTxCredits. Conforming devices should never hit the cap.
Which versions are affected by CVE-2026-68365?
How do I fix CVE-2026-68365?
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-2026-68365 being exploited?
There is no known exploitation of CVE-2026-68365 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68365, DEBIAN-CVE-2026-68365, GHSA-xfrx-g64h-2x84, UBUNTU-CVE-2026-68365.