CVE-2022-49110

netfilter: conntrack: revisit gc autotuning

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/58d52743ae85d28c9335c6034d6ce350b8689951
https://git.kernel.org/stable/c/7cd361d5e6d986c0d4cafb9ceaa803359048ae15
https://git.kernel.org/stable/c/592e57591826f3d09c28d755a39ea8e9d13705ad
https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833

Frequently Asked Questions

What is the severity of CVE-2022-49110?: CVE-2022-49110 has not yet been assigned a CVSS score.
How to fix CVE-2022-49110?: To fix CVE-2022-49110, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49110 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49110 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49110?: CVE-2022-49110 affects Linux Linux, Linux Linux.

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