{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-39871",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39871",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-23T06:00:44.882Z",
    "updatedAt": "2026-10-15T01:08:33.888Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "dmaengine: idxd: Remove improper idxd_free",
      "summary": "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 <TASK>\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() -> device_unregister() -> 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.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "68ac5a01f635b3791196fd1c39bc48497252c36f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "24414bbcb37e1af95190af36c21ae51d497e1a9e"
            },
            {
              "version": "d2d05fd0fc95c4defed6f7b87550e20e8baa1d97",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0e95ee7f532b21206fe3f1c4054002b0d21e3b9c"
            },
            {
              "version": "21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dd7a7e43269711d757fc260b0bbdf7138f75de11"
            },
            {
              "version": "d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805",
              "status": "affected",
              "versionType": "git",
              "lessThan": "da4fbc1488a4cec6748da685181ee4449a878dac"
            },
            {
              "version": "d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f41c538881eec4dcf5961a242097d447f848cda6"
            },
            {
              "version": "2b7a961cea0e5b65afda911f76d14fec5c98d024",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6.1.140",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.160"
            },
            {
              "version": "6.6.92",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.107"
            },
            {
              "version": "6.12.30",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.12.48"
            },
            {
              "version": "6.14.8",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.15"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.15"
            },
            {
              "version": "6.1.160",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.107",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.48",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.16.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "version": "6.17",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}