Ilia Gavrilov

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 5.10.209 Description: The issue is related to the incorrect initialization order in the drop monitor module. When built as a kernel module, syzkaller may send a netlink NET DM CMD START message during module loading, calling the net dm monitor start() function that uses an uninitialized spinlock. This can lead to a spinlock bad magic error. The problem is resolved by prioritizing resource initialization above the registration of a generic netlink family. Recommendations: To fix this issue, update the Linux kernel to a version that includes the fix for the incorrect initialization order in the drop monitor module. If the kernel version is prior to 5.10.209, consider updating to a newer version to mitigate the risk. As a temporary workaround, consider disabling the drop monitor module until a patch is available.