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

netfilter: conntrack: revisit gc autotuning

as of commit 4608fdfc07e1
("netfilter: conntrack: collect all entries in one cycle")
conntrack gc was changed to run every 2 minutes.

On systems where conntrack hash table is set to large value, most evictions
happen from gc worker rather than the packet path due to hash table
distribution.

This causes netlink event overflows when events are collected.

This change collects average expiry of scanned entries and
reschedules to the average remaining value, within 1 to 60 second interval.

To avoid event overflows, reschedule after each bucket and add a
limit for both run time and number of evictions per run.

If more entries have to be evicted, reschedule and restart 1 jiffy
into the future.

https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833

https://git.kernel.org/stable/c/58d52743ae85d28c9335c6034d6ce350b8689951

https://git.kernel.org/stable/c/592e57591826f3d09c28d755a39ea8e9d13705ad

https://git.kernel.org/stable/c/7cd361d5e6d986c0d4cafb9ceaa803359048ae15