CVE-2026-64583 (GCVE-0-2026-64583)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:06 – Updated: 2026-08-06 07:06
VLAI
Title
usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: efed421a94e62a7ddbc76acba4312b70e4be958f , < 1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8 (git)
Affected: efed421a94e62a7ddbc76acba4312b70e4be958f , < f6fc21ec7ccd83726ba766d73d0b8cc03e726475 (git)
Affected: efed421a94e62a7ddbc76acba4312b70e4be958f , < dcf3e2f164435b5844706cb8eefef29ebee0eedb (git)
Affected: efed421a94e62a7ddbc76acba4312b70e4be958f , < d4964a74717107697999f48bcb4e80a9c0679a27 (git)
Affected: efed421a94e62a7ddbc76acba4312b70e4be958f , < 0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/udc/bdc/bdc_core.c",
            "drivers/usb/gadget/udc/bdc/bdc_udc.c"
          ],
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          "vendor": "Linux",
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              "versionType": "git"
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              "versionType": "git"
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/udc/bdc/bdc_core.c",
            "drivers/usb/gadget/udc/bdc/bdc_udc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.19"
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              "lessThan": "3.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-06T07:06:25.335Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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"
      }
    }
  },
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    "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": "2026-08-06T07:06:25.335Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64583",
      "date": "2026-08-06",
      "epss": "0.00156",
      "percentile": "0.05258"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64583\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-06T08:16:33.390\",\"lastModified\":\"2026-08-06T08:16:33.390\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/udc/bdc/bdc_core.c\",\"drivers/usb/gadget/udc/bdc/bdc_udc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"efed421a94e62a7ddbc76acba4312b70e4be958f\",\"lessThan\":\"1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"efed421a94e62a7ddbc76acba4312b70e4be958f\",\"lessThan\":\"f6fc21ec7ccd83726ba766d73d0b8cc03e726475\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"efed421a94e62a7ddbc76acba4312b70e4be958f\",\"lessThan\":\"dcf3e2f164435b5844706cb8eefef29ebee0eedb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"efed421a94e62a7ddbc76acba4312b70e4be958f\",\"lessThan\":\"d4964a74717107697999f48bcb4e80a9c0679a27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"efed421a94e62a7ddbc76acba4312b70e4be958f\",\"lessThan\":\"0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/udc/bdc/bdc_core.c\",\"drivers/usb/gadget/udc/bdc/bdc_udc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.