CVE-2025-71097

In the Linux kernel, the following vulnerability has been resolved:

ipv4: Fix reference count leak when using error routes with nexthop objects

When a nexthop object is deleted, it is marked as dead and then

fib_table_flush() is called to flush all the routes that are using the

dead nexthop.

The current logic in fib_table_flush() is to only flush error routes

(e.g., blackhole) when it is called as part of network namespace

dismantle (i.e., with flush_all=true). Therefore, error routes are not

flushed when their nexthop object is deleted:

# ip link add name dummy1 up type dummy

# ip nexthop add id 1 dev dummy1

# ip route add 198.51.100.1/32 nhid 1

# ip route add blackhole 198.51.100.2/32 nhid 1

# ip nexthop del id 1

# ip route show

blackhole 198.51.100.2 nhid 1 dev dummy1

As such, they keep holding a reference on the nexthop object which in

turn holds a reference on the nexthop device, resulting in a reference

count leak:

# ip link del dev dummy1

[ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2

Fix by flushing error routes when their nexthop is marked as dead.

IPv6 does not suffer from this problem.