CVE-2022-49110 (GCVE-0-2022-49110)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2025-12-23 13:21
VLAI?
Title
netfilter: conntrack: revisit gc autotuning
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d , < 58d52743ae85d28c9335c6034d6ce350b8689951 (git)
Affected: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d , < 7cd361d5e6d986c0d4cafb9ceaa803359048ae15 (git)
Affected: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d , < 592e57591826f3d09c28d755a39ea8e9d13705ad (git)
Affected: 4608fdfc07e116f9fc0895beb40abad7cdb5ee3d , < 2cfadb761d3d0219412fd8150faea60c7e863833 (git)
Affected: dafc95a1e473a0b857af34ecbb17b8b1c90edd75 (git)
Affected: 5892f910f401c1facfc410e0b042108f2827a77b (git)
Affected: f68ad168e23565ce2a3891fec537cfaf8410d1e6 (git)
Affected: 7aa03980b21fdc7355e20274a68a69a0b2a45c08 (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.34 , ≤ 5.15.* (semver)
Unaffected: 5.16.20 , ≤ 5.16.* (semver)
Unaffected: 5.17.3 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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          "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."
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      "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/2cfadb761d3d0219412fd8150faea60c7e863833"
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      "title": "netfilter: conntrack: revisit gc autotuning",
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    "dateReserved": "2025-02-26T01:49:39.251Z",
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    "state": "PUBLISHED"
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}


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