CVE-2025-40223 (GCVE-0-2025-40223)
Vulnerability from cvelistv5
Published
2025-12-04 15:31
Modified
2025-12-04 15:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: most: usb: Fix use-after-free in hdm_disconnect hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface->dev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing. The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts). Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface(). This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.
References
Impacted products
Vendor Product Version
Linux Linux Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
Version: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/most/most_usb.c"
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              "version": "6.17.6",
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmost: usb: Fix use-after-free in hdm_disconnect\n\nhdm_disconnect() calls most_deregister_interface(), which eventually\nunregisters the MOST interface device with device_unregister(iface-\u003edev).\nIf that drops the last reference, the device core may call release_mdev()\nimmediately while hdm_disconnect() is still executing.\n\nThe old code also freed several mdev-owned allocations in\nhdm_disconnect() and then performed additional put_device() calls.\nDepending on refcount order, this could lead to use-after-free or\ndouble-free when release_mdev() ran (or when unregister paths also\nperformed puts).\n\nFix by moving the frees of mdev-owned allocations into release_mdev(),\nso they happen exactly once when the device is truly released, and by\ndropping the extra put_device() calls in hdm_disconnect() that are\nredundant after device_unregister() and most_deregister_interface().\n\nThis addresses the KASAN slab-use-after-free reported by syzbot in\nhdm_disconnect(). See report and stack traces in the bug link below."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T15:31:15.158Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831"
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          "url": "https://git.kernel.org/stable/c/578eb18cd111addec94c43f61cd4b4429e454809"
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          "url": "https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6"
        },
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          "url": "https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce"
        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5"
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      ],
      "title": "most: usb: Fix use-after-free in hdm_disconnect",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40223",
    "datePublished": "2025-12-04T15:31:15.158Z",
    "dateReserved": "2025-04-16T07:20:57.180Z",
    "dateUpdated": "2025-12-04T15:31:15.158Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40223\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:14.767\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmost: usb: Fix use-after-free in hdm_disconnect\\n\\nhdm_disconnect() calls most_deregister_interface(), which eventually\\nunregisters the MOST interface device with device_unregister(iface-\u003edev).\\nIf that drops the last reference, the device core may call release_mdev()\\nimmediately while hdm_disconnect() is still executing.\\n\\nThe old code also freed several mdev-owned allocations in\\nhdm_disconnect() and then performed additional put_device() calls.\\nDepending on refcount order, this could lead to use-after-free or\\ndouble-free when release_mdev() ran (or when unregister paths also\\nperformed puts).\\n\\nFix by moving the frees of mdev-owned allocations into release_mdev(),\\nso they happen exactly once when the device is truly released, and by\\ndropping the extra put_device() calls in hdm_disconnect() that are\\nredundant after device_unregister() and most_deregister_interface().\\n\\nThis addresses the KASAN slab-use-after-free reported by syzbot in\\nhdm_disconnect(). See report and stack traces in the bug link below.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/578eb18cd111addec94c43f61cd4b4429e454809\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f93a84ffb884d761a9d4e869ba29c238711e81f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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