CVE-2026-80947

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80947", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.803Z", "datePublished": "2026-09-11T19:42:18.282Z", "dateUpdated": "2026-10-30T12:31:28.821Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:31:28.821Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/realtek/rtl8xxxu/core.c"], "versions": [{"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "75e7e19e9218e3b895e652f04acf08113dc3aa00", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "da1678cca182567fd84618b689f4424f3f55f712", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "06e6bbb0abc2ae22e6e4d184250075e5c9e090d6", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "17d5ae58973122eea7625a87cd3d80a8beb23b47", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "800d2b490a9af1e7132a3564c2ad5a81292e5b40", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "620acb1e8037b73a457dc8ef20fc23fc7adcb405", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "972ab8b9c08f3eb3fa535082de2950dd93604dfd", "status": "affected", "versionType": "git"}, {"version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "lessThan": "6c080026ecc17eecb103f8927c64ea73a74bb818", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/realtek/rtl8xxxu/core.c"], "versions": [{"version": "4.4", "status": "affected"}, {"version": "0", "lessThan": "4.4", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/75e7e19e9218e3b895e652f04acf08113dc3aa00"}, {"url": "https://git.kernel.org/stable/c/da1678cca182567fd84618b689f4424f3f55f712"}, {"url": "https://git.kernel.org/stable/c/06e6bbb0abc2ae22e6e4d184250075e5c9e090d6"}, {"url": "https://git.kernel.org/stable/c/17d5ae58973122eea7625a87cd3d80a8beb23b47"}, {"url": "https://git.kernel.org/stable/c/800d2b490a9af1e7132a3564c2ad5a81292e5b40"}, {"url": "https://git.kernel.org/stable/c/620acb1e8037b73a457dc8ef20fc23fc7adcb405"}, {"url": "https://git.kernel.org/stable/c/972ab8b9c08f3eb3fa535082de2950dd93604dfd"}, {"url": "https://git.kernel.org/stable/c/6c080026ecc17eecb103f8927c64ea73a74bb818"}], "title": "wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/realtek/rtl8xxxu/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "75e7e19e9218e3b895e652f04acf08113dc3aa00", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "da1678cca182567fd84618b689f4424f3f55f712", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "06e6bbb0abc2ae22e6e4d184250075e5c9e090d6", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "17d5ae58973122eea7625a87cd3d80a8beb23b47", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "800d2b490a9af1e7132a3564c2ad5a81292e5b40", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "620acb1e8037b73a457dc8ef20fc23fc7adcb405", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "972ab8b9c08f3eb3fa535082de2950dd93604dfd", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}, {"lessThan": "6c080026ecc17eecb103f8927c64ea73a74bb818", "status": "affected", "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/realtek/rtl8xxxu/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.4"}, {"lessThan": "4.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-80947", "lastModified": "2026-10-30T13:20:14.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:00.303", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06e6bbb0abc2ae22e6e4d184250075e5c9e090d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/17d5ae58973122eea7625a87cd3d80a8beb23b47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/620acb1e8037b73a457dc8ef20fc23fc7adcb405"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c080026ecc17eecb103f8927c64ea73a74bb818"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75e7e19e9218e3b895e652f04acf08113dc3aa00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/800d2b490a9af1e7132a3564c2ad5a81292e5b40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/972ab8b9c08f3eb3fa535082de2950dd93604dfd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da1678cca182567fd84618b689f4424f3f55f712"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel rtl8xxxu Wi-Fi driver: Use-after-free during driver stop", "id": "2532317", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532317"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `rtl8xxxu` Wi-Fi driver. A race condition exists during the driver's stop process, specifically when handling receive (RX) Universal Serial Bus (USB) Request Blocks (URBs). This allows a worker to access memory that has already been freed, leading to a use-after-free vulnerability. This issue can result in system instability or a denial of service."], "name": "CVE-2026-80947", "public_date": "2026-09-11T19:42:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80947\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80947\nhttps://git.kernel.org/stable/c/620acb1e8037b73a457dc8ef20fc23fc7adcb405\nhttps://git.kernel.org/stable/c/6c080026ecc17eecb103f8927c64ea73a74bb818\nhttps://git.kernel.org/stable/c/800d2b490a9af1e7132a3564c2ad5a81292e5b40\nhttps://git.kernel.org/stable/c/972ab8b9c08f3eb3fa535082de2950dd93604dfd"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa,800d2b490a9af1e7132a3564c2ad5a81292e5b40)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa,620acb1e8037b73a457dc8ef20fc23fc7adcb405)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa,972ab8b9c08f3eb3fa535082de2950dd93604dfd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa,6c080026ecc17eecb103f8927c64ea73a74bb818)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T01:45:03.771209+00:00", "updated": "2026-09-21T03:00:12.567805+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}