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Unrated severityNVD Advisory· Published Feb 26, 2025· Updated Dec 23, 2025

netfilter: conntrack: revisit gc autotuning

CVE-2022-49110

Description

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.

Affected products

128

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

4

News mentions

0

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