CVE-2022-49110 (GCVE-0-2022-49110)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-12-23 13:21
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d
Version: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d
Version: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d
Version: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d
Version: dafc95a1e473a0b857af34ecbb17b8b1c90edd75
Version: 5892f910f401c1facfc410e0b042108f2827a77b
Version: f68ad168e23565ce2a3891fec537cfaf8410d1e6
Version: 7aa03980b21fdc7355e20274a68a69a0b2a45c08
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{
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: revisit gc autotuning\n\nas of commit 4608fdfc07e1\n(\"netfilter: conntrack: collect all entries in one cycle\")\nconntrack gc was changed to run every 2 minutes.\n\nOn systems where conntrack hash table is set to large value, most evictions\nhappen from gc worker rather than the packet path due to hash table\ndistribution.\n\nThis causes netlink event overflows when events are collected.\n\nThis change collects average expiry of scanned entries and\nreschedules to the average remaining value, within 1 to 60 second interval.\n\nTo avoid event overflows, reschedule after each bucket and add a\nlimit for both run time and number of evictions per run.\n\nIf more entries have to be evicted, reschedule and restart 1 jiffy\ninto the future."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:21:57.815Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/58d52743ae85d28c9335c6034d6ce350b8689951"
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        },
        {
          "url": "https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833"
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      ],
      "title": "netfilter: conntrack: revisit gc autotuning",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49110",
    "datePublished": "2025-02-26T01:54:55.998Z",
    "dateReserved": "2025-02-26T01:49:39.251Z",
    "dateUpdated": "2025-12-23T13:21:57.815Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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