CVE-2025-71097 (GCVE-0-2025-71097)
Vulnerability from cvelistv5
Published
2026-01-13 15:34
Modified
2026-07-14 12:44
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
Version: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e
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