{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-22997",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-22997"
  ],
  "published": "2026-01-25T14:36:48Z",
  "summary": "net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts\n\nSince j1939_session_deactivate_activate_next() in j1939_tp_rxtimer() is\ncalled only when the timer is enabled, we need to call\nj1939_session_deactivate_activate_next() if we cancelled the timer.\nOtherwise, refcount for j1939_session leaks, which will later appear as\n\n| unregister_netdevice: waiting for vcan0 to become free. Usage count = 2.\n\nproblem.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-22997"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable path is reached by received SAE J1939 transport-control frames delivered through the CAN network receive path into j1939_can_recv(), j1939_tp_recv(), j1939_tp_cmd_recv(), j1939_xtp_rx_rts(), and then j1939_xtp_rx_rts_session_active(). A remote CAN/J1939 peer can send the duplicate RTS/BAM sequence to a Linux node using a bound J1939 socket, so the attacker does not need local execution on the target.\nAC:L - The trigger is a controlled protocol sequence involving a second RTS/BAM for an active receiver session; the attacker controls the packet timing and contents. No hard-to-win race or condition outside attacker influence is required.\nPR:N - Received CAN/J1939 frames enter the vulnerable receive path without authentication or credential checks. In the highest reasonable deployment, the attacker is an unauthenticated peer on the J1939/CAN network.\nUI:N - No victim interaction is required once the target is running the J1939 stack with a bound socket. The attacker only needs to transmit the crafted J1939 frames.\nS:U - The bug affects kernel CAN/J1939 session and netdevice lifetime management within the same kernel security authority. It does not cross a VM, sandbox, IOMMU, or other separate security boundary.\nC:N - The bug is a reference-count leak caused by failing to deactivate a receiver session after cancelling its timer. The investigation did not identify memory disclosure, arbitrary read, or use-after-free behavior.\nI:N - The leaked references pin session/private/netdevice objects but do not provide attacker-controlled data modification or a write primitive. There is no evidence of control-flow corruption or persistent data tampering.\nA:H - The leaked J1939 session/private references pin the CAN net_device and can make unregister_netdevice wait indefinitely with a nonzero usage count. This is a persistent denial of service against network device or namespace teardown and can be retriggered."
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}