CVE-2025-39721 (GCVE-0-2025-39721)
Vulnerability from cvelistv5
Published
2025-09-05 17:21
Modified
2025-09-29 05:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - flush misc workqueue during device shutdown Repeated loading and unloading of a device specific QAT driver, for example qat_4xxx, in a tight loop can lead to a crash due to a use-after-free scenario. This occurs when a power management (PM) interrupt triggers just before the device-specific driver (e.g., qat_4xxx.ko) is unloaded, while the core driver (intel_qat.ko) remains loaded. Since the driver uses a shared workqueue (`qat_misc_wq`) across all devices and owned by intel_qat.ko, a deferred routine from the device-specific driver may still be pending in the queue. If this routine executes after the driver is unloaded, it can dereference freed memory, resulting in a page fault and kernel crash like the following: BUG: unable to handle page fault for address: ffa000002e50a01c #PF: supervisor read access in kernel mode RIP: 0010:pm_bh_handler+0x1d2/0x250 [intel_qat] Call Trace: pm_bh_handler+0x1d2/0x250 [intel_qat] process_one_work+0x171/0x340 worker_thread+0x277/0x3a0 kthread+0xf0/0x120 ret_from_fork+0x2d/0x50 To prevent this, flush the misc workqueue during device shutdown to ensure that all pending work items are completed before the driver is unloaded. Note: This approach may slightly increase shutdown latency if the workqueue contains jobs from other devices, but it ensures correctness and stability.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d4df408ba9bad2b205c7fb8afc1836a6a4ca88a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5858448a6c65d8ee3f8600570d3ce19febcb33be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e59a52e429e13df3feb34f4853a8e36d121ed937
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe546f5c50fc474daca6bee72caa7ab68a74c33d
Impacted products
Vendor Product Version
Linux Linux Version: e5745f34113b758b45d134dec04a7df94dc67131
Version: e5745f34113b758b45d134dec04a7df94dc67131
Version: e5745f34113b758b45d134dec04a7df94dc67131
Version: e5745f34113b758b45d134dec04a7df94dc67131
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   Linux Linux Version: 5.18
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_init.c",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c"
          ],
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          "programFiles": [
            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_init.c",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c"
          ],
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          "vendor": "Linux",
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              "version": "6.6.103",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - flush misc workqueue during device shutdown\n\nRepeated loading and unloading of a device specific QAT driver, for\nexample qat_4xxx, in a tight loop can lead to a crash due to a\nuse-after-free scenario. This occurs when a power management (PM)\ninterrupt triggers just before the device-specific driver (e.g.,\nqat_4xxx.ko) is unloaded, while the core driver (intel_qat.ko) remains\nloaded.\n\nSince the driver uses a shared workqueue (`qat_misc_wq`) across all\ndevices and owned by intel_qat.ko, a deferred routine from the\ndevice-specific driver may still be pending in the queue. If this\nroutine executes after the driver is unloaded, it can dereference freed\nmemory, resulting in a page fault and kernel crash like the following:\n\n    BUG: unable to handle page fault for address: ffa000002e50a01c\n    #PF: supervisor read access in kernel mode\n    RIP: 0010:pm_bh_handler+0x1d2/0x250 [intel_qat]\n    Call Trace:\n      pm_bh_handler+0x1d2/0x250 [intel_qat]\n      process_one_work+0x171/0x340\n      worker_thread+0x277/0x3a0\n      kthread+0xf0/0x120\n      ret_from_fork+0x2d/0x50\n\nTo prevent this, flush the misc workqueue during device shutdown to\nensure that all pending work items are completed before the driver is\nunloaded.\n\nNote: This approach may slightly increase shutdown latency if the\nworkqueue contains jobs from other devices, but it ensures correctness\nand stability."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:58:07.985Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/5858448a6c65d8ee3f8600570d3ce19febcb33be"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe546f5c50fc474daca6bee72caa7ab68a74c33d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e59a52e429e13df3feb34f4853a8e36d121ed937"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d4df408ba9bad2b205c7fb8afc1836a6a4ca88a"
        }
      ],
      "title": "crypto: qat - flush misc workqueue during device shutdown",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39721",
    "datePublished": "2025-09-05T17:21:28.911Z",
    "dateReserved": "2025-04-16T07:20:57.117Z",
    "dateUpdated": "2025-09-29T05:58:07.985Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39721\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:49.770\",\"lastModified\":\"2025-09-08T16:25:38.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: qat - flush misc workqueue during device shutdown\\n\\nRepeated loading and unloading of a device specific QAT driver, for\\nexample qat_4xxx, in a tight loop can lead to a crash due to a\\nuse-after-free scenario. This occurs when a power management (PM)\\ninterrupt triggers just before the device-specific driver (e.g.,\\nqat_4xxx.ko) is unloaded, while the core driver (intel_qat.ko) remains\\nloaded.\\n\\nSince the driver uses a shared workqueue (`qat_misc_wq`) across all\\ndevices and owned by intel_qat.ko, a deferred routine from the\\ndevice-specific driver may still be pending in the queue. If this\\nroutine executes after the driver is unloaded, it can dereference freed\\nmemory, resulting in a page fault and kernel crash like the following:\\n\\n    BUG: unable to handle page fault for address: ffa000002e50a01c\\n    #PF: supervisor read access in kernel mode\\n    RIP: 0010:pm_bh_handler+0x1d2/0x250 [intel_qat]\\n    Call Trace:\\n      pm_bh_handler+0x1d2/0x250 [intel_qat]\\n      process_one_work+0x171/0x340\\n      worker_thread+0x277/0x3a0\\n      kthread+0xf0/0x120\\n      ret_from_fork+0x2d/0x50\\n\\nTo prevent this, flush the misc workqueue during device shutdown to\\nensure that all pending work items are completed before the driver is\\nunloaded.\\n\\nNote: This approach may slightly increase shutdown latency if the\\nworkqueue contains jobs from other devices, but it ensures correctness\\nand stability.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3d4df408ba9bad2b205c7fb8afc1836a6a4ca88a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5858448a6c65d8ee3f8600570d3ce19febcb33be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e59a52e429e13df3feb34f4853a8e36d121ed937\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe546f5c50fc474daca6bee72caa7ab68a74c33d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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