CVE-2026-64583 (GCVE-0-2026-64583)
Vulnerability from cvelistv5
Published
2026-08-06 07:06
Modified
2026-08-23 12:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown The Broadcom BDC UDC driver registers its IRQ handler with devm_request_irq() in bdc_udc_init(), so the IRQ is released by devm only after bdc_remove() returns. devm releases resources in reverse LIFO order, but bdc_remove() runs bdc_udc_exit() and bdc_hw_exit() -> bdc_mem_free() manually before returning: bdc_udc_exit() tears down individual endpoint objects via bdc_free_ep(), while bdc_hw_exit() -> bdc_mem_free() frees and NULLs the DMA-coherent status-report ring (bdc->srr.sr_bds) and kfree()s bdc->bdc_ep_array. Both happen while the IRQ handler (bdc_udc_interrupt, requested with IRQF_SHARED) remains deliverable in the window up to the post-remove devm free_irq(). On receipt of a shared interrupt in that window, bdc_udc_interrupt() dereferences bdc->srr.sr_bds[bdc->srr.dqp_index] (NULL or freed DMA) and dispatches sr_handler callbacks that index into bdc_ep_array, causing a NULL-deref or use-after-free. The same window affects the delayed_work bdc->func_wake_notify, which is armed from the IRQ handler via bdc_sr_uspc() -> handle_link_state_change() -> schedule_delayed_work() and may self-rearm from its own callback bdc_func_wake_timer(). No cancel exists anywhere in the driver, so a queued work item that fires after bdc_remove() returns and the bdc structure is devm-freed dereferences freed memory. Replace devm_request_irq() with request_irq() and add an explicit free_irq(bdc->irq, bdc) in bdc_remove(). Clear BDC_GIE before free_irq() to stop the device from asserting interrupts, then free_irq() drains any in-flight handler, then cancel_delayed_work_sync() drains the func_wake_notify delayed work. This ordering ensures the IRQ handler and delayed work cannot interfere with the subsequent endpoint and DMA teardown in bdc_udc_exit() and bdc_hw_exit(). Wire the matching free_irq() into the bdc_udc_init() error path so the IRQ is released on probe failure, and route the bdc_init_ep() failure through err0 instead of returning directly. This issue was found by an in-house static analysis tool.
References
Impacted products
Vendor Product Version
Linux Linux Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
Version: efed421a94e62a7ddbc76acba4312b70e4be958f
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{
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          "programFiles": [
            "drivers/usb/gadget/udc/bdc/bdc_core.c",
            "drivers/usb/gadget/udc/bdc/bdc_udc.c"
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            "drivers/usb/gadget/udc/bdc/bdc_udc.c"
          ],
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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: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown\n\nThe Broadcom BDC UDC driver registers its IRQ handler with\ndevm_request_irq() in bdc_udc_init(), so the IRQ is released by devm\nonly after bdc_remove() returns.  devm releases resources in reverse\nLIFO order, but bdc_remove() runs bdc_udc_exit() and bdc_hw_exit() -\u003e\nbdc_mem_free() manually before returning: bdc_udc_exit() tears down\nindividual endpoint objects via bdc_free_ep(), while bdc_hw_exit() -\u003e\nbdc_mem_free() frees and NULLs the DMA-coherent status-report ring\n(bdc-\u003esrr.sr_bds) and kfree()s bdc-\u003ebdc_ep_array.  Both happen while\nthe IRQ handler (bdc_udc_interrupt, requested with IRQF_SHARED)\nremains deliverable in the window up to the post-remove devm\nfree_irq().\n\nOn receipt of a shared interrupt in that window, bdc_udc_interrupt()\ndereferences bdc-\u003esrr.sr_bds[bdc-\u003esrr.dqp_index] (NULL or freed DMA)\nand dispatches sr_handler callbacks that index into bdc_ep_array,\ncausing a NULL-deref or use-after-free.\n\nThe same window affects the delayed_work bdc-\u003efunc_wake_notify, which is\narmed from the IRQ handler via bdc_sr_uspc() -\u003e handle_link_state_change()\n-\u003e schedule_delayed_work() and may self-rearm from its own callback\nbdc_func_wake_timer().  No cancel exists anywhere in the driver, so a\nqueued work item that fires after bdc_remove() returns and the bdc\nstructure is devm-freed dereferences freed memory.\n\nReplace devm_request_irq() with request_irq() and add an explicit\nfree_irq(bdc-\u003eirq, bdc) in bdc_remove().  Clear BDC_GIE before\nfree_irq() to stop the device from asserting interrupts, then\nfree_irq() drains any in-flight handler, then cancel_delayed_work_sync()\ndrains the func_wake_notify delayed work.  This ordering ensures the\nIRQ handler and delayed work cannot interfere with the subsequent\nendpoint and DMA teardown in bdc_udc_exit() and bdc_hw_exit().  Wire the\nmatching free_irq() into the bdc_udc_init() error path so the IRQ is\nreleased on probe failure, and route the bdc_init_ep() failure through\nerr0 instead of returning directly.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable window opens on local BDC platform-driver teardown (sysfs unbind/rmmod \u2192 bdc_remove), not on parsing USB host packets; that matches other USB gadget/UDC teardown UAFs scored AV:L and is higher severity than Physical.\nAC:L - The attacker controls remove/bind retries; a pending func_wake_notify (never cancelled before the fix) runs deterministically on the post-remove freed bdc, and IRQF_SHARED plus USB activity can also hit the IRQ window during teardown.\nPR:L - Highest reasonable exposure is a local account managing the gadget/UDC on Android or Broadcom STB systems where platform unbind is delegated beyond init-namespace root; uncertain Low vs High, so Low per the overestimate rule.\nUI:N - The attacker performs driver remove and any prior link-state activity that arms func_wake_notify themselves; no separate victim mount, open, or other interaction is required.\nS:U - NULL-deref/use-after-free of sr_bds, bdc_ep_array, and the delayed-work bdc object stays inside the host kernel authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free of the DMA status-report ring, endpoint array, and the bdc object via IRQ/work handlers allows reclaim/spray and disclosure of kernel memory, which per UAF guidance is High.\nI:H - The same UAF paths write through freed endpoint/status structures and run delayed work on a freed bdc, enabling heap corruption and control-flow hijack suitable for privilege escalation.\nA:H - Dereferencing NULL/freed sr_bds in hard-IRQ context or executing bdc_func_wake_timer on a post-remove freed bdc causes kernel oops/panic, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:42.500Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eac1107e54679db2df2c36d8bba3b66d3ab6cbcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b0b76e31b3991a899ae724eb97d359de0c0f1b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/3fe181952b8a1aeb167d4503c794c0f5050f08ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27"
        },
        {
          "url": "https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb"
        }
      ],
      "title": "usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64583",
    "datePublished": "2026-08-06T07:06:25.335Z",
    "dateReserved": "2026-07-19T15:36:31.798Z",
    "dateUpdated": "2026-08-23T12:45:42.500Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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