{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-45860",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-45860"
  ],
  "published": "2026-05-27T12:19:29Z",
  "summary": "netfilter: nf_conncount: increase the connection clean up limit to 64",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: increase the connection clean up limit to 64\n\nAfter the optimization to only perform one GC per jiffy, a new problem\nwas introduced. If more than 8 new connections are tracked per jiffy the\nlist won't be cleaned up fast enough possibly reaching the limit\nwrongly.\n\nIn order to prevent this issue, only skip the GC if it was already\ntriggered during the same jiffy and the increment is lower than the\nclean up limit. In addition, increase the clean up limit to 64\nconnections to avoid triggering GC too often and do more effective GCs.\n\nThis has been tested using a HTTP server and several\nperformance tools while having nft_connlimit/xt_connlimit or OVS limit\nconfigured.\n\nOutput of slowhttptest + OVS limit at 52000 connections:\n\n slow HTTP test status on 340th second:\n initializing:        0\n pending:             432\n connected:           51998\n error:               0\n closed:              0\n service available:   YES",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45860"
    },
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:N - The code runs in a netfilter packet-processing hook (nft_connlimit/xt_connlimit/OVS limit); it is driven by connection packets from a remote peer, so the vulnerability is reachable over the network.\nAC:L - The attacker fully controls the trigger condition (generating more than 8 new connections per jiffy), which is trivially achievable with ordinary connection flooding and requires no conditions outside the attacker's control.\nPR:N - A remote attacker merely opening connections to a connlimit-protected service needs no authentication or privileges on the target system.\nUI:N - Exploitation requires only sending connection traffic; no victim interaction is needed.\nS:U - The faulty accounting and its effect stay within the kernel's network stack and the protected service; no security boundary is crossed.\nC:N - The bug is a connection-count accounting error with no memory disclosure or information leak of any kind.\nI:N - No attacker-controlled data is modified and there is no memory corruption; only the internal connection counter is transiently inaccurate.\nA:H - The inflated count causes the connlimit to reach its threshold prematurely, so legitimate new connections to the protected service are rejected; an attacker can sustain this to deny service (total loss of new-connection availability under a global/zone limit)."
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}