{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64093",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64093"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "batman-adv: tp_meter: directly shut down timer on cleanup",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: directly shut down timer on cleanup\n\nbatadv_tp_sender_cleanup() was calling timer_delete_sync() followed by\ntimer_delete() to guard against the timer handler re-arming itself between\nthe two calls. This double-deletion hack relied on the sending status being\nset to 0 to suppress re-arming.\n\nReplace both calls with a single timer_shutdown_sync(). This function both\nwaits for any running timer callback to complete (like timer_delete_sync())\nand permanently disarms the timer so it cannot be re-armed afterwards,\nmaking re-arming prevention unconditional and self-documenting.\n\nThe re-arming property is also required because otherwise:\n\n1. context 0 (batadv_tp_recv_ack()) checks in\n   batadv_tp_reset_sender_timer() if sending is still 1 -> it is\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\n   this process forces the kthread to stop timer in\n   batadv_tp_sender_cleanup()\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\n   timer -> but the reference for it is already gone",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64093"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bug is triggered in batadv_tp_recv_ack() when forged or legitimate BATADV_TP_ACK mesh packets are received on a batman-adv hard interface; exploitation requires membership on the same batman-adv mesh (shared WiFi/ethernet logical network), which is Adjacent under CVSS and kernel WiFi guidance.\nAC:L - This is a race between batadv_tp_recv_ack()/batadv_tp_reset_sender_timer() and batadv_tp_sender_cleanup(); an adjacent mesh attacker controls ACK timing and can flood packets to reliably hit the window between timer_delete_sync() and timer_delete() while the session tears down.\nPR:N - The vulnerable receive path has no capability or authentication checks; any mesh peer can send TP ACK packets matching an active session without CAP_NET_ADMIN or other privileges on the victim (session start via netlink is a victim-side precondition, not attacker privilege).\nUI:N - Exploitation requires only attacker-timed mesh packets during session teardown; no victim end-user action (opening files, clicking links, etc.) is needed beyond normal mesh operation.\nS:U - Impact is a kernel heap use-after-free in batman-adv with potential privilege escalation; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Re-arming mod_timer() on a freed batadv_tp_vars after batadv_tp_vars_put() is a classic use-after-free; the attacker can influence freed heap contents and obtain arbitrary kernel memory read primitives.\nI:H - The UAF corrupts timer_list and adjacent kmalloc object fields; combined with heap grooming this enables arbitrary kernel writes and control-flow hijacking, not merely a bounded modification.\nA:H - When the re-armed timer fires on freed memory, batadv_tp_sender_timeout() dereferences stale tp_vars pointers, causing kernel oops/panic and reliable remote denial of service even without full exploitation."
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}