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Change History

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

8021q: delete cleared egress QoS mappings

vlan_dev_set_egress_priority() currently keeps cleared egress
priority mappings in the hash as tombstones. Repeated set/clear cycles
with distinct skb priorities therefore accumulate mapping nodes until
device teardown and leak memory.

Delete mappings when vlan_prio is cleared instead of keeping tombstones.
Now that the egress mapping lists are RCU protected, the node can be
unlinked safely and freed after a grace period.

https://git.kernel.org/stable/c/7dddc74af369478ba7f9bc136d0fc1dc4570cb66

https://git.kernel.org/stable/c/a52e122c9e4d56ad9a03b32c915a199276d989c3