Prashanth K

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 6.6.74 **Description** A vulnerability in the Linux kernel's u serial driver has been resolved. The issue occurred when the `gs start io` function accessed a null pointer, causing a crash. This happened in extreme cases where multiple threads accessed the u serial driver, and one thread executed the `gs open` function while another thread executed the `gserial disconnect` function, setting the `port->port usb` pointer to NULL. To fix this, a null pointer check was added to `gs start io` before attempting to access the `port->port usb` pointer. **Recommendations** Update to Linux kernel version 6.6.74 or later to resolve the issue. As a temporary workaround, consider adding a null pointer check to `gs start io` before attempting to access the `port->port usb` pointer.