{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72125",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72125"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER\n\nisotp_release() looked up the bound network device via dev_get_by_index()\nusing the stored ifindex. During device unregistration the device is\nunlisted from the ifindex hash before the NETDEV_UNREGISTER notifier\nchain runs, so a concurrent isotp_release() could find no device, skip\ncan_rx_unregister() entirely, and still proceed to free the socket.\nSince isotp_release() had already removed itself from the isotp\nnotifier list at that point, isotp_notify() would never get a chance to\nclean up either, leaving a stale CAN filter that keeps pointing at the\nfreed socket.\n\nFix this the same way raw.c already does: hold a tracked reference to\nthe bound net_device in the socket (so->dev/so->dev_tracker) from\nbind() onward instead of re-resolving it from the ifindex, and\nserialize bind()/release() with rtnl_lock() so that so->dev is always\nconsistent with what the NETDEV_UNREGISTER notifier sees. so->dev\nstays valid regardless of ifindex-hash unlisting, and is only ever\ncleared by whichever of isotp_release()/isotp_notify() gets there\nfirst, so the filter is always removed exactly once.\n\nisotp_bind() now rejects a (re)bind with -EAGAIN while so->[tx|rx].state\nisn't ISOTP_IDLE yet, so a timer left running by a prior\nNETDEV_UNREGISTER can't act on a newly bound so->ifindex. Both checks\nshare the same lock_sock() section, so there is no window in which a\nconcurrent isotp_notify() clearing so->bound could be missed.",
  "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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            "upstream_fixed": "6.18.40"
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72125"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f311bbb29bb06aaab69ba45a6e4b11323d20b8f9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e018f4335590460ebcf0c2b493ed38ba1a35204"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/33b9cd9245e2a4b800f99ed1cc53d64960614152"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43884dc7963beef2328f507f4fe680bdc173eb80"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7bef39ba76eb7307ed22a50329e0f5776dbeda58"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e442b62ba5a7756c17e05a77b32cdd085a2b6138"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20bab8b88baac140ca3701116e1d486c7f51e311"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local AF_CAN ISO-TP socket operations (socket/bind/close) racing NETDEV_UNREGISTER on the bound CAN interface; stale-filter UAF is triggered via local frame injection or an existing bound interface, not a remote IP/network service.\nAC:L - The attacker controls both sides of the race by concurrently closing the ISO-TP socket and unregistering the bound CAN device (e.g., vcan create/delete with CAP_NET_ADMIN in a user namespace), and can retry until the stale RX filter is left on a freed socket.\nPR:L - No init-namespace root is required: any local user can open CAN_ISOTP sockets, and CAP_NET_ADMIN obtainable in user namespaces suffices to create/delete vcan and drive the unregister path used in automotive/embedded ISO-TP (UDS) deployments.\nUI:N - No victim interaction is needed; the use-after-free is triggered by the attacker's own concurrent close()/NETDEV_UNREGISTER operations and subsequent CAN frames sent to the bound IDs.\nS:U - Impact is kernel heap corruption and potential privilege escalation within the same OS security boundary; it does not inherently cross VM, container, or IOMMU isolation boundaries.\nC:H - A stale can_rx filter keeps calling isotp_rcv()/isotp_rcv_echo() with a freed isotp_sock, enabling reads of reallocated slab contents through socket state, sock_queue_rcv_skb(), and protocol parsing on attacker-influenced memory.\nI:H - The UAF path performs extensive writes to freed socket state (RX/TX buffers, timers, generation counters) and can emit CAN traffic, providing primitives for heap shaping and control-flow hijack rather than a crash-only fault.\nA:H - Use-after-free in softirq CAN receive callbacks commonly causes kernel oops/panic from dereferencing or writing freed isotp_sock/timer state, even before reliable exploitation."
    }
  }
}