CVE-2025-39871 (GCVE-0-2025-39871)
Vulnerability from cvelistv5
Published
2025-09-23 06:00
Modified
2025-09-29 06:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Remove improper idxd_free The call to idxd_free() introduces a duplicate put_device() leading to a reference count underflow: refcount_t: underflow; use-after-free. WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... Call Trace: <TASK> idxd_remove+0xe4/0x120 [idxd] pci_device_remove+0x3f/0xb0 device_release_driver_internal+0x197/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x74/0xf0 pci_unregister_driver+0x2e/0xb0 idxd_exit_module+0x34/0x7a0 [idxd] __do_sys_delete_module.constprop.0+0x183/0x280 do_syscall_64+0x54/0xd70 entry_SYSCALL_64_after_hwframe+0x76/0x7e The idxd_unregister_devices() which is invoked at the very beginning of idxd_remove(), already takes care of the necessary put_device() through the following call path: idxd_unregister_devices() -> device_unregister() -> put_device() In addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may trigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is called immediately after, it can result in a use-after-free. Remove the improper idxd_free() to avoid both the refcount underflow and potential memory corruption during module unload.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e95ee7f532b21206fe3f1c4054002b0d21e3b9c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6
Impacted products
Vendor Product Version
Linux Linux Version: d2d05fd0fc95c4defed6f7b87550e20e8baa1d97
Version: 21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7
Version: d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805
Version: d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805
Version: 68ac5a01f635b3791196fd1c39bc48497252c36f
Version: 2b7a961cea0e5b65afda911f76d14fec5c98d024
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   Linux Linux Version: 6.15
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/dma/idxd/init.c"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Remove improper idxd_free\n\nThe call to idxd_free() introduces a duplicate put_device() leading to a\nreference count underflow:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n...\nCall Trace:\n \u003cTASK\u003e\n  idxd_remove+0xe4/0x120 [idxd]\n  pci_device_remove+0x3f/0xb0\n  device_release_driver_internal+0x197/0x200\n  driver_detach+0x48/0x90\n  bus_remove_driver+0x74/0xf0\n  pci_unregister_driver+0x2e/0xb0\n  idxd_exit_module+0x34/0x7a0 [idxd]\n  __do_sys_delete_module.constprop.0+0x183/0x280\n  do_syscall_64+0x54/0xd70\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe idxd_unregister_devices() which is invoked at the very beginning of\nidxd_remove(), already takes care of the necessary put_device() through the\nfollowing call path:\nidxd_unregister_devices() -\u003e device_unregister() -\u003e put_device()\n\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\ncalled immediately after, it can result in a use-after-free.\n\nRemove the improper idxd_free() to avoid both the refcount underflow and\npotential memory corruption during module unload."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:01:27.766Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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          "url": "https://git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11"
        },
        {
          "url": "https://git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac"
        },
        {
          "url": "https://git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6"
        }
      ],
      "title": "dmaengine: idxd: Remove improper idxd_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39871",
    "datePublished": "2025-09-23T06:00:44.882Z",
    "dateReserved": "2025-04-16T07:20:57.143Z",
    "dateUpdated": "2025-09-29T06:01:27.766Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39871\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-23T06:15:46.400\",\"lastModified\":\"2025-09-24T18:11:24.520\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndmaengine: idxd: Remove improper idxd_free\\n\\nThe call to idxd_free() introduces a duplicate put_device() leading to a\\nreference count underflow:\\nrefcount_t: underflow; use-after-free.\\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n  idxd_remove+0xe4/0x120 [idxd]\\n  pci_device_remove+0x3f/0xb0\\n  device_release_driver_internal+0x197/0x200\\n  driver_detach+0x48/0x90\\n  bus_remove_driver+0x74/0xf0\\n  pci_unregister_driver+0x2e/0xb0\\n  idxd_exit_module+0x34/0x7a0 [idxd]\\n  __do_sys_delete_module.constprop.0+0x183/0x280\\n  do_syscall_64+0x54/0xd70\\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nThe idxd_unregister_devices() which is invoked at the very beginning of\\nidxd_remove(), already takes care of the necessary put_device() through the\\nfollowing call path:\\nidxd_unregister_devices() -\u003e device_unregister() -\u003e put_device()\\n\\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\\ncalled immediately after, it can result in a use-after-free.\\n\\nRemove the improper idxd_free() to avoid both the refcount underflow and\\npotential memory corruption during module unload.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e95ee7f532b21206fe3f1c4054002b0d21e3b9c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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