CVE-2022-49110 (GCVE-0-2022-49110)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-05-04 08:30
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
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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_core.c"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "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": "2025-05-04T08:30:05.756Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833"
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      ],
      "title": "netfilter: conntrack: revisit gc autotuning",
      "x_generator": {
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  "cveMetadata": {
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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": "2025-05-04T08:30:05.756Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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