Skip to content
Heist/ feed
High

wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop

Type: advisorySource: Official CVE List1 source record

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->udev. 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. * r

Announced Source revision 1
Original source ↗

CVE-2026-80947

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80947

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa",
        "lessThan": "17d5ae58973122eea7625a87cd3d80a8beb23b47",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa",
        "lessThan": "800d2b490a9af1e7132a3564c2ad5a81292e5b40",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa",
        "lessThan": "620acb1e8037b73a457dc8ef20fc23fc7adcb405",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa",
        "lessThan": "972ab8b9c08f3eb3fa535082de2950dd93604dfd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26f1fad29ad973b0fb26a9ca3dcb2a73dde781aa",
        "lessThan": "6c080026ecc17eecb103f8927c64ea73a74bb818",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/realtek/rtl8xxxu/core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/realtek/rtl8xxxu/core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80947

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46649 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement