{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68116",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68116"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "vxlan: mdb: Fix source list corruption on a failed replace",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: mdb: Fix source list corruption on a failed replace\n\nWhen replacing the source list of an MDB remote entry, all existing\nsources are first marked for deletion and vxlan_mdb_remote_srcs_add()\nis then called to add the new source list. Sources present in the new\nlist have their deletion mark cleared, and any sources left marked\nafterwards are removed.\n\nIf vxlan_mdb_remote_srcs_add() fails partway through, its error path\ndeletes all entries on the remote's source list. That rollback is only\ncorrect for its other caller, vxlan_mdb_remote_add(), where the remote\nwas just allocated and the list contains solely entries added during\nthe call. On the replace path the list also holds pre-existing sources,\nso a failed replace tears them down together with their (S, G)\nforwarding entries instead of leaving the entry unchanged.\n\nThis is reachable from an existing (*, G) remote. An EXCLUDE filter\nthat loses sources starts forwarding traffic that should be blocked,\nwhile an INCLUDE filter that loses sources drops traffic that should be\nforwarded.\n\nMark entries created during the current pass with a new\nVXLAN_SGRP_F_NEW flag. On failure, delete only those entries and clear\nthe deletion mark on the pre-existing ones, so a failed replace leaves\nthe source list untouched. Retain the flag until the whole operation\nsucceeds and then clear it. Also stop vxlan_mdb_remote_src_add() from\ndeleting a pre-existing entry it only looked up when adding that\nentry's forwarding entry fails.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68116"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5bc8fc1d2ff802eec839e03adef5df597421898d"
    },
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      "url": "https://git.kernel.org/stable/c/2c54dff57606590fa4abec46bab6bea3133f1539"
    },
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      "url": "https://git.kernel.org/stable/c/79370b573e92e8f190eb5f9a511fa5398340d8b2"
    },
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      "url": "https://git.kernel.org/stable/c/54a3c27b357dfb34f327f89bfadeb998bef8051e"
    },
    {
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      "url": "https://git.kernel.org/stable/c/dcd9b465965422b9654f6026e8a2fa8984f74c3c"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.9,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is only reachable via the RTM_NEWMDB rtnetlink control path (ndo_mdb_add); multicast data-plane packets use vxlan_mdb_xmit and never hit the replace/rollback logic.\nAC:L - An attacker with CAP_NET_ADMIN can create an existing (*,G) remote, issue NLM_F_REPLACE with a new source list, and reliably force vxlan_mdb_remote_srcs_add() to fail mid-loop (e.g., ENOMEM via memory pressure) to trigger the bad rollback.\nPR:L - rtnetlink requires CAP_NET_ADMIN for RTM_NEWMDB; this capability is obtainable by unprivileged users inside user/network namespaces, not solely by init-namespace root.\nUI:N - Exploitation requires only crafted rtnetlink MDB messages from a process with network-admin capability; no victim user action is needed.\nS:C - A corrupted EXCLUDE source list forwards multicast that policy intended to block to VXLAN remote peers, crossing intended overlay segmentation boundaries beyond the misconfigured netdev's local authority.\nC:L - EXCLUDE filter corruption removes per-source block rules, causing multicast payloads from previously blocked sources to be encapsulated and delivered to unauthorized VXLAN remotes.\nI:L - Failed replace corrupts MDB source lists and (S,G) forwarding state, causing unauthorized multicast delivery (EXCLUDE) or dropping traffic that should be forwarded (INCLUDE).\nA:H - INCLUDE filter corruption can wipe all source entries on a (*,G) remote, causing vxlan_mdb_xmit to permanently drop all multicast for that group until MDB state is manually repaired."
    }
  }
}