{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40140",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-40140"
  ],
  "published": "2025-11-12T10:24:04Z",
  "summary": "net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast\n\nsyzbot reported WARNING in rtl8150_start_xmit/usb_submit_urb.\nThis is the sequence of events that leads to the warning:\n\nrtl8150_start_xmit() {\n\tnetif_stop_queue();\n\tusb_submit_urb(dev->tx_urb);\n}\n\nrtl8150_set_multicast() {\n\tnetif_stop_queue();\n\tnetif_wake_queue();\t\t<-- wakes up TX queue before URB is done\n}\n\nrtl8150_start_xmit() {\n\tnetif_stop_queue();\n\tusb_submit_urb(dev->tx_urb);\t<-- double submission\n}\n\nrtl8150_set_multicast being the ndo_set_rx_mode callback should not be\ncalling netif_stop_queue and notif_start_queue as these handle\nTX queue synchronization.\n\nThe net core function dev_set_rx_mode handles the synchronization\nfor rtl8150_set_multicast making it safe to remove these locks.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40140"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cce3c0e21cdd15bcba5c35d3af1700186de8f187"
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      "url": "https://git.kernel.org/stable/c/9d72df7f5eac946f853bf49c428c4e87a17d91da"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The buggy `ndo_set_rx_mode` callback is reachable from an unauthenticated attacker on the same L2 segment: flooding IPv6 Router Advertisements with fresh prefixes drives SLAAC address creation \u2192 `addrconf_join_solict()` \u2192 `ipv6_dev_mc_inc` \u2192 `igmp6_group_added` \u2192 `dev_mc_add` \u2192 `__dev_set_rx_mode` \u2192 `rtl8150_set_multicast`, while the same attacker keeps a TX URB in flight by eliciting ICMP/ARP/RST replies. RAs are link-local and non-routable, so Adjacent rather than Network; the vector is the network stack, not the USB bus.\nAC:L - The attacker controls both sides of the race \u2014 they generate the TX load that guarantees an in-flight URB and drive rx_mode changes at an arbitrary rate \u2014 and the attempt is freely repeatable. The window between `urb->hcpriv = NULL` and `urb->complete()` in `__usb_hcd_giveback_urb()` is widened further by bulk giveback being deferred to a BH workqueue.\nPR:N - IPv6 Router Advertisement processing is unauthenticated by design and `accept_ra=1` is the default on non-forwarding hosts, so no credentials of any kind are needed on the adjacent path. Even the purely local path requires only an unprivileged `setsockopt(IP_ADD_MEMBERSHIP)` loop with no capabilities.\nUI:N - The kernel processes Router Advertisements and performs the resulting solicited-node multicast joins automatically in softirq on packet receive. No victim action is required at any point.\nS:U - The corruption is confined to kernel memory of the affected host, within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free leaves the HCD DMA-ing from a freed sk_buff data buffer and transmitting its contents onto the attacker's network segment, directly leaking reallocated kernel heap memory. Per guidance, a UAF also generically warrants C:H because it gives the attacker control over freed-object contents.\nI:H - The double free of an sk_buff corrupts the `skbuff_head_cache` slab freelist, a well-known heap-shaping and arbitrary-write primitive, and the still-queued URB writes/reads memory that can be reallocated to other kernel users mid-transfer.\nA:H - The reported `WARN_ONCE(\"URB submitted while active\")` is a kernel oops and a full panic under `panic_on_warn=1`, which is set in many hardened and production configurations. The UAF and double free crash the kernel outright, and the TX path is additionally left leaking sk_buffs."
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}