ghsa-xfjg-jx94-93h4
Vulnerability from github
Published
2025-09-05 18:31
Modified
2025-09-08 09:31
Details

In the Linux kernel, the following vulnerability has been resolved:

x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

Since

923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot")

resctrl_cpu_detect() has been moved from common CPU initialization code to the vendor-specific BSP init helper, while Hygon didn't put that call in their code.

This triggers a division by zero fault during early booting stage on our machines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries to calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale.

Add the missing resctrl_cpu_detect() in the Hygon BSP init helper.

[ bp: Massage commit message. ]

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39681"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-05T18:15:44Z",
    "severity": null
  },
  "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\u0027t 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. ]",
  "id": "GHSA-xfjg-jx94-93h4",
  "modified": "2025-09-08T09:31:09Z",
  "published": "2025-09-05T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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