github - ghsa-xfjg-jx94-93h4

GHSA-XFJG-JX94-93H4

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-03 18:31

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": "2025-11-03T18:31:39Z",
  "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"
    },
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      "url": "https://git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-39681 (GCVE-0-2025-39681)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2025-11-03 17:42

Title

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

Summary

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. ]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/62f12cde101182533…
	https://git.kernel.org/stable/c/873f32201df8876bd…
	https://git.kernel.org/stable/c/fb81222c1559f89bf…
	https://git.kernel.org/stable/c/7207923d8453ebfb3…
	https://git.kernel.org/stable/c/a9e5924daa954c9f5…
	https://git.kernel.org/stable/c/d23264c257a70dbe0…
	https://git.kernel.org/stable/c/d8df126349dad855c…

Impacted products

Vendor

Product

Version

Linux

Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < 62f12cde10118253348a7540e85606869bd69432 (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < 873f32201df8876bdb2563e3187e79149427cab4 (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < fb81222c1559f89bfe3aa1010f6d112531d55353 (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < 7207923d8453ebfb35667c1736169f2dd796772e (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < a9e5924daa954c9f585c1ca00358afe71d6781c4 (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < d23264c257a70dbe021b43b3bc2ee16134cd2c69 (git)
Affected: 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 , < d8df126349dad855cdfedd6bbf315bad2e901c2f (git)

Linux

Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.242 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-XFJG-JX94-93H4

CVE-2025-39681 (GCVE-0-2025-39681)

Tags

Sightings

Nomenclature