{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80947",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80947"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop\n\nrtl8xxxu arms rx_urb_wq from the RX completion path:\nrtl8xxxu_rx_complete() hands the URB to rtl8xxxu_queue_rx_urb(), which\nqueues it on rx_urb_pending_list and, once the list grows past\nRTL8XXXU_RX_URB_PENDING_WATER, schedules rx_urb_wq.  The worker\nrtl8xxxu_rx_urb_work() drains rx_urb_pending_list, recovers priv through\ncontainer_of, and resubmits each URB through rtl8xxxu_submit_rx_urb(),\nwhich anchors it on rx_anchor and dereferences priv->udev.\n\nrtl8xxxu_stop() cancels the sibling work items (c2hcmd_work, ra_watchdog,\nupdate_beacon_work) but never cancels rx_urb_wq, so a worker armed during\nthe last burst of RX traffic can run rtl8xxxu_rx_urb_work() after\nrtl8xxxu_disconnect() has called ieee80211_free_hw(), which frees priv,\nproducing a use-after-free.  The window opens under active RX traffic\n(pending count above the watermark) followed by a disconnect.\n\nThere are two teardown races to close:\n\n  * rtl8xxxu_queue_rx_urb() decided whether to enqueue under rx_urb_lock\n    but called schedule_work() after dropping the lock.  A completion\n    that observed shutdown == false and released the lock could then call\n    schedule_work() after rtl8xxxu_stop() had set shutdown and\n    cancel_work_sync() had already returned, arming the worker to run\n    after the teardown.  Move schedule_work() under the same !shutdown\n    branch so the arming decision is atomic with the shutdown check.\n\n  * rtl8xxxu_rx_urb_work() anchors every URB it drained back onto\n    rx_anchor through rtl8xxxu_submit_rx_urb().  A worker still running\n    when usb_kill_anchored_urbs(&priv->rx_anchor) returned would submit a\n    URB that escaped the kill.  In rtl8xxxu_stop(), call\n    cancel_work_sync(&priv->rx_urb_wq) before the kill so the worker is\n    drained first.\n\nAfter priv->shutdown is set under rx_urb_lock, completions can no longer\nqueue rx_urb_wq. cancel_work_sync() then drains the last queued or running\nworker, and the following usb_kill_anchored_urbs() kills the URBs it may\nhave submitted.\n\nrtl8xxxu_disconnect() is covered because ieee80211_unregister_hw()\nguarantees .stop() runs for a live interface before ieee80211_free_hw()\nfrees priv.  The probe error path needs no cancel: rx_urb_wq is\nINIT_WORK()'d there but cannot have been scheduled, since no URB is\nsubmitted before ieee80211_register_hw() succeeds.\n\nThis bug was found by static analysis.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80947"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/800d2b490a9af1e7132a3564c2ad5a81292e5b40"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/620acb1e8037b73a457dc8ef20fc23fc7adcb405"
    },
    {
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      "url": "https://git.kernel.org/stable/c/972ab8b9c08f3eb3fa535082de2950dd93604dfd"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6c080026ecc17eecb103f8927c64ea73a74bb818"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-13T06:49:25Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached when rtl8xxxu_stop()/rtl8xxxu_disconnect() runs while rx_urb_wq is armed. An adjacent Wi-Fi peer can complete RX URBs and queue the work, but cannot invoke stop or ieee80211_free_hw(); teardown is a local action (interface down, rfkill, suspend, USB unbind or unplug).\nAC:L - The attacker controls both sides of the race: they generate RX traffic so rx_urb_pending_count exceeds RTL8XXXU_RX_URB_PENDING_WATER (8) and schedule_work(&rx_urb_wq) fires, then they trigger stop/disconnect while the worker is queued or still resubmitting URBs, retrying until the window after ieee80211_free_hw() is hit.\nPR:L - An ordinary local user can trigger teardown via logind-mediated suspend, rfkill, or USB unplug on a shared workstation, and needs no capability to generate the RX traffic that queues rx_urb_wq. CAP_NET_ADMIN to bring the interface down is also available via user namespaces when the wiphy is delegated into that netns.\nUI:N - The attacker generates the RX burst and performs the interface stop or USB disconnect themselves; no separate victim must open a file, mount a filesystem, or otherwise interact.\nS:U - The use-after-free corrupts the rtl8xxxu_priv kernel object and USB URB state inside the host kernel; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - rtl8xxxu_rx_urb_work() recovers the freed priv via container_of and reads priv->udev, priv->fops, and pending-list/rx_anchor state. A sprayed replacement slab object therefore yields an arbitrary kernel read primitive.\nI:H - The worker list_splice_init()s the freed pending list, usb_anchor_urb()s onto priv->rx_anchor, and the workqueue core mutates the embedded work_struct inside the freed priv, giving heap-write and control-flow hijack primitives.\nA:H - Executing rtl8xxxu_rx_urb_work() against freed priv oopses or panics on the spinlock, list, or udev dereference, and the attacker can retrigger it on every device stop or USB disconnect."
    }
  }
}