{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39681",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-39681"
  ],
  "published": "2025-09-05T17:22:05Z",
  "summary": "x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper\n\nSince\n\n  923f3a2b48bd (\"x86/resctrl: Query LLC monitoring properties once during boot\")\n\nresctrl_cpu_detect() has been moved from common CPU initialization code to\nthe vendor-specific BSP init helper, while Hygon didn't put that call in their\ncode.\n\nThis triggers a division by zero fault during early booting stage on our\nmachines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries\nto calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale.\n\nAdd the missing resctrl_cpu_detect() in the Hygon BSP init helper.\n\n  [ bp: Massage commit message. ]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.149",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39681"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}