kernel: geneve: Fix use-after-free in geneve_find_dev().

A use-after-free vulnerability exists in the Linux kernel. When devnet is dismantled, the geneveexitbatchrtnl function calls unregisternetdevicequeue for each device in the network namespace. Later, when the device is freed, it is still linked to the backend UDP socket in the network namespace...

UBUNTU-CVE-2025-21678

In the Linux kernel, the following vulnerability has been resolved: gtp: Destroy device along with udp socket's netns dismantle. gtpnewlink links the device to a list in devnetdev instead of srcnet, where a udp tunnel socket is created. Even when srcnet is removed, the device stays alive on...