CVE-2022-49110
netfilter: conntrack: revisit gc autotuning
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.61% · top 51% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d – < 58d52743ae85d28c9335c6034d6ce350b8689951
- affected 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d – < 7cd361d5e6d986c0d4cafb9ceaa803359048ae15
- affected 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d – < 592e57591826f3d09c28d755a39ea8e9d13705ad
- affected 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d – < 2cfadb761d3d0219412fd8150faea60c7e863833
- affected dafc95a1e473a0b857af34ecbb17b8b1c90edd75
- affected 5892f910f401c1facfc410e0b042108f2827a77b
- affected f68ad168e23565ce2a3891fec537cfaf8410d1e6
- affected 7aa03980b21fdc7355e20274a68a69a0b2a45c08
- affected 4.19.206 – < 4.20
- affected 5.4.144 – < 5.5
- affected 5.10.62 – < 5.11
- affected 5.13.14 – < 5.14
- affected 5.14
- unaffected < 5.14
- unaffected 5.15.34 – ≤ 5.15.*
- unaffected 5.16.20 – ≤ 5.16.*
- unaffected 5.17.3 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (4)
- https://git.kernel.org/stable/c/58d52743ae85d28c9335c6034d6ce350b8689951 (opens in a new tab)
- https://git.kernel.org/stable/c/7cd361d5e6d986c0d4cafb9ceaa803359048ae15 (opens in a new tab)
- https://git.kernel.org/stable/c/592e57591826f3d09c28d755a39ea8e9d13705ad (opens in a new tab)
- https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49110)Record last updated .