{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43180",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43180"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "net: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode\n\nkaweth_set_rx_mode(), the ndo_set_rx_mode callback, calls\nnetif_stop_queue() and netif_wake_queue(). These are TX queue flow\ncontrol functions unrelated to RX multicast configuration.\n\nThe premature netif_wake_queue() can re-enable TX while tx_urb is still\nin-flight, leading to a double usb_submit_urb() on the same URB:\n\nkaweth_start_xmit() {\n    netif_stop_queue();\n    usb_submit_urb(kaweth->tx_urb);\n}\n\nkaweth_set_rx_mode() {\n    netif_stop_queue();\n    netif_wake_queue();             // wakes TX queue before URB is done\n}\n\nkaweth_start_xmit() {\n    netif_stop_queue();\n    usb_submit_urb(kaweth->tx_urb); // URB submitted while active\n}\n\nThis triggers the WARN in usb_submit_urb():\n\n  \"URB submitted while active\"\n\nThis is a similar class of bug fixed in rtl8150 by\n\n- commit 958baf5eaee3 (\"net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast\").\n\nAlso kaweth_set_rx_mode() is already functionally broken, the\nreal set_rx_mode action is performed by kaweth_async_set_rx_mode(),\nwhich in turn is not a no-op only at ndo_open() time.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43180"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "cvss_v3_score": 7.8,
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      "scenario": "AV:L - The vulnerable callback is reachable through local socket operations such as IPv4/IPv6 multicast membership changes on a host with a kaweth USB Ethernet interface. Remote network packets alone do not invoke ndo_set_rx_mode.\nAC:L - The attacker can control both sides by generating transmit traffic while repeatedly changing multicast/RX mode state. The active-URB window is repeatable and does not depend on conditions outside attacker control once the affected device is present.\nPR:L - A local unprivileged user can reach the callback through normal multicast socket membership paths without CAP_NET_ADMIN. Admin ioctl/netlink paths also exist, but they are not the least-privileged path.\nUI:N - No victim action is required after the affected interface is present and usable. The attacker can trigger both TX and RX-mode changes from their own local process.\nS:U - The impact remains within the same kernel/host security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The second transmit can refill an active URB and overwrite kaweth->tx_skb; the failed submit frees that skb while completion later uses/frees the same pointer. Treating this kernel heap UAF/double-free as exploitable, high confidentiality impact is defensible.\nI:H - The stale skb and active URB manipulation create kernel memory corruption, not merely a clean error return. With heap shaping, this can plausibly become arbitrary write or control-flow compromise.\nA:H - At minimum the bug triggers the usb_submit_urb active-URB WARN path. The associated UAF/double-free memory corruption can also oops, panic, or hang the kernel."
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}