{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46208",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46208"
  ],
  "published": "2026-05-28T09:40:54Z",
  "summary": "batman-adv: stop tp_meter sessions during mesh teardown",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: stop tp_meter sessions during mesh teardown\n\nTP meter sessions remain linked on bat_priv->tp_list after the netlink\nrequest has already finished. When the mesh interface is removed,\nbatadv_mesh_free() currently tears down the mesh without first draining\nthese sessions.\n\nA running sender thread or a late incoming tp_meter packet can then keep\nprocessing against a mesh instance which is already shutting down.\nSynchronize tp_meter with the mesh lifetime by stopping all active\nsessions from batadv_mesh_free() and waiting for sender threads to exit\nbefore teardown continues.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46208"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5e7d0ac936354c36810e74ac3056b334ed1f4058"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The controllable trigger is the local `BATADV_CMD_TP_METER` netlink command plus local interface teardown (rtnetlink); the \"late packet\" receiver path is not remotely controllable since the remote peer cannot drive the victim's teardown timing.\nAC:L - The attacker controls both sides of the race\u2014starting a session with an attacker-chosen `test_length` (default 10s) keeps the sender thread/receiver timer alive, then removing the interface triggers the free\u2014giving a large, reliably winnable window.\nPR:L - The tp_meter netlink op is `GENL_UNS_ADMIN_PERM`, i.e. CAP_NET_ADMIN checked against the netns owner's user namespace, which an unprivileged user obtains via `unshare -Urn`.\nUI:N - Both the session start and the mesh teardown are performed by the attacker; no victim interaction is required.\nS:U - The corruption stays within the kernel's own memory/security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free on the netdev private data lets the attacker control freed-object contents and read adjacent/reallocated kernel memory.\nI:H - The freed `bat_priv` object can be reclaimed via heap spraying, yielding a write/control-flow-hijack primitive from the still-running sender thread and receiver timer.\nA:H - The use-after-free reliably causes a kernel oops/panic when the stale `bat_priv` and mesh tables are dereferenced after `free_netdev()`."
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}