CVE-2026-64465 (GCVE-0-2026-64465)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix sleep in atomic context in xhci_free_streams() When a USB device with active stream endpoints is disconnected, xhci_free_streams() is called from the hub_event workqueue to free the stream resources. It calls xhci_free_stream_info() while holding xhci->lock with irqs disabled. xhci_free_stream_info() invokes xhci_free_stream_ctx(), which calls dma_free_coherent() for large stream context arrays. dma_free_coherent() can sleep (e.g. via vunmap), triggering a BUG when called from atomic context. Call trace: dma_free_attrs+0x174/0x220 xhci_free_stream_info+0xd0/0x11c xhci_free_streams+0x278/0x37c usb_free_streams+0x98/0xc0 usb_unbind_interface+0x1b8/0x2f8 device_release_driver_internal+0x1d4/0x2cc device_release_driver+0x18/0x28 bus_remove_device+0x160/0x1a4 device_del+0x1ec/0x350 usb_disable_device+0x98/0x214 usb_disconnect+0xf0/0x35c hub_event+0xab4/0x19ec process_one_work+0x278/0x63c Fix this by saving the stream_info pointers and clearing the ep references under the lock, then calling xhci_free_stream_info() outside the lock where sleeping is allowed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
Version: 8df75f42f8e67e2851cdcf6da91640fb881defd1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/host/xhci.c"
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          "vendor": "Linux",
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              "version": "0",
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: xhci: Fix sleep in atomic context in xhci_free_streams()\n\nWhen a USB device with active stream endpoints is disconnected,\nxhci_free_streams() is called from the hub_event workqueue to\nfree the stream resources.  It calls xhci_free_stream_info()\nwhile holding xhci-\u003elock with irqs disabled.\n\nxhci_free_stream_info() invokes xhci_free_stream_ctx(), which\ncalls dma_free_coherent() for large stream context arrays.\n\ndma_free_coherent() can sleep (e.g. via vunmap), triggering\na BUG when called from atomic context.\n\nCall trace:\n dma_free_attrs+0x174/0x220\n xhci_free_stream_info+0xd0/0x11c\n xhci_free_streams+0x278/0x37c\n usb_free_streams+0x98/0xc0\n usb_unbind_interface+0x1b8/0x2f8\n device_release_driver_internal+0x1d4/0x2cc\n device_release_driver+0x18/0x28\n bus_remove_device+0x160/0x1a4\n device_del+0x1ec/0x350\n usb_disable_device+0x98/0x214\n usb_disconnect+0xf0/0x35c\n hub_event+0xab4/0x19ec\n process_one_work+0x278/0x63c\n\nFix this by saving the stream_info pointers and clearing the\nep references under the lock, then calling xhci_free_stream_info()\noutside the lock where sleeping is allowed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:56:10.537Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e623e4a203f56d5c57519a9a3cb29600551534ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/d107eb316144c5fb958486e7fe604cd7f1b35cda"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e45aa722c4ce5663e987102aac18c8ad6a83fdd"
        },
        {
          "url": "https://git.kernel.org/stable/c/10666ac9c552990204e791af653abf8e9d9ff619"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7b022ae07685e7526fc39f387ce65b5d309dd3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f90586129cf9e1fbdb718ef602eea3f15dc1c31c"
        },
        {
          "url": "https://git.kernel.org/stable/c/93cd037da94fcb93183bfb2457e3a56d3eb4c8f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/42c37c4b75d38b51d84f31a8e29427f5e06a7c2a"
        }
      ],
      "title": "usb: xhci: Fix sleep in atomic context in xhci_free_streams()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64465",
    "datePublished": "2026-07-25T08:51:31.160Z",
    "dateReserved": "2026-07-19T15:36:31.790Z",
    "dateUpdated": "2026-08-17T04:56:10.537Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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