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dmaengine: idxd: Remove improper idxd_free

Type: advisorySource: Official CVE List1 source record

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: 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.

Announced Source revision 1
Original source ↗

CVE-2025-39871

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-2025-39871

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": "68ac5a01f635b3791196fd1c39bc48497252c36f",
        "lessThan": "24414bbcb37e1af95190af36c21ae51d497e1a9e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d2d05fd0fc95c4defed6f7b87550e20e8baa1d97",
        "lessThan": "0e95ee7f532b21206fe3f1c4054002b0d21e3b9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7",
        "lessThan": "dd7a7e43269711d757fc260b0bbdf7138f75de11",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805",
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        "versionType": "git"
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        "status": "affected",
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        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b7a961cea0e5b65afda911f76d14fec5c98d024",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.1.140",
        "lessThan": "6.1.160",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.92",
        "lessThan": "6.6.107",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.30",
        "lessThan": "6.12.48",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.14.8",
        "lessThan": "6.15",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/dma/idxd/init.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.107",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.48",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.8",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/dma/idxd/init.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39871

Source reference: /cveMetadata/cveId

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Event
#27074 · Revision 1
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