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crypto: qat - flush misc workqueue during device shutdown

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-39721

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-39721

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "e5745f34113b758b45d134dec04a7df94dc67131",
        "lessThan": "fa4c14a82747886d333d8baef0d26da86ba1ccf7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e5745f34113b758b45d134dec04a7df94dc67131",
        "lessThan": "5858448a6c65d8ee3f8600570d3ce19febcb33be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e5745f34113b758b45d134dec04a7df94dc67131",
        "lessThan": "fe546f5c50fc474daca6bee72caa7ab68a74c33d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e5745f34113b758b45d134dec04a7df94dc67131",
        "lessThan": "e59a52e429e13df3feb34f4853a8e36d121ed937",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e5745f34113b758b45d134dec04a7df94dc67131",
        "lessThan": "3d4df408ba9bad2b205c7fb8afc1836a6a4ca88a",
        "versionType": "git"
      }
    ],
    "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"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.162",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "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"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39721

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#27060 · Revision 1
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