Linux Kernel Vulnerability in Lapbether Driver

CVE-2025-39796

What is CVE-2025-39796?

A vulnerability has been identified in the Linux kernel's lapbether driver that could lead to potential issues related to improper lock handling. The weakness arises when operations are performed on locked network devices, which can lead to a lock dependency being triggered in the xsk_notify function through register_netdevice. To mitigate these issues, the kernel now bypasses adding lapbether for operations-locked devices, ensuring more stable notifications and better handling of device events without risking lock-related conflicts.

References