{ "cveId": "CVE-2026-80947", "url": "https://patchblox.com/security/cve/CVE-2026-80947", "summary": "CVE-2026-80947 is fixed in 48 products on 1 platform, first by DEBIAN-CVE-2026-80947, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop", "description": "In the Linux kernel, the following vulnerability has been resolved: wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop rtl8xxxu arms rx_urb_wq from the RX completion path: rtl8xxxu_rx_complete() hands the URB to rtl8xxxu_queue_rx_urb(), which queues it on rx_urb_pending_list and, once the list grows past RTL8XXXU_RX_URB_PENDING_WATER, schedules rx_urb_wq. The worker rtl8xxxu_rx_urb_work() drains rx_urb_pending_list, recovers priv through container_of, and resubmits each URB through rtl8xxxu_submit_rx_urb(), which anchors it on rx_anchor and dereferences priv-\u003Eudev. rtl8xxxu_stop() cancels the sibling work items (c2hcmd_work, ra_watchdog, update_beacon_work) but never cancels rx_urb_wq, so a worker armed during the last burst of RX traffic can run rtl8xxxu_rx_urb_work() after rtl8xxxu_disconnect() has called ieee80211_free_hw(), which frees priv, producing a use-after-free. The window opens under active RX traffic (pending count above the watermark) followed by a disconnect. There are two teardown races to close: * rtl8xxxu_queue_rx_urb() decided whether to enqueue under rx_urb_lock but called schedule_work() after dropping the lock. A completion that observed shutdown == false and released the lock could then call schedule_work() after rtl8xxxu_stop() had set shutdown and cancel_work_sync() had already returned, arming the worker to run after the teardown. Move schedule_work() under the same !shutdown branch so the arming decision is atomic with the shutdown check. * rtl8xxxu_rx_urb_work() anchors every URB it drained back onto rx_anchor through rtl8xxxu_submit_rx_urb(). A worker still running when usb_kill_anchored_urbs(\u0026priv-\u003Erx_anchor) returned would submit a URB that escaped the kill. In rtl8xxxu_stop(), call cancel_work_sync(\u0026priv-\u003Erx_urb_wq) before the kill so the worker is drained first. After priv-\u003Eshutdown is set under rx_urb_lock, completions can no longer queue rx_urb_wq. cancel_work_sync() then drains the last queued or running worker, and the following usb_kill_anchored_urbs() kills the URBs it may have submitted. rtl8xxxu_disconnect() is covered because ieee80211_unregister_hw() guarantees .stop() runs for a live interface before ieee80211_free_hw() frees priv. The probe error path needs no cancel: rx_urb_wq is INIT_WORK()\u0027d there but cannot have been scheduled, since no URB is submitted before ieee80211_register_hw() succeeds. This bug was found by static analysis.", "published": "2026-09-11T20:19:00Z", "severity": "Moderate", "cvss": 9.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00164, "epssPercentile": 0.05685, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80947", "fixes": [ { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.84.1", "fix": "SUSE-SU-2026:4706-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4706-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.84.1", "fix": "SUSE-SU-2026:4706-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4706-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 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