github - ghsa-g6f5-85j8-c4fr

ghsa-g6f5-85j8-c4fr

Vulnerability from github

Published

2025-09-16 15:32

Modified

2025-09-16 15:32

Details

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

KVM: x86: use array_index_nospec with indices that come from guest

min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39823"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T13:16:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: use array_index_nospec with indices that come from guest\n\nmin and dest_id are guest-controlled indices. Using array_index_nospec()\nafter the bounds checks clamps these values to mitigate speculative execution\nside-channels.",
  "id": "GHSA-g6f5-85j8-c4fr",
  "modified": "2025-09-16T15:32:36Z",
  "published": "2025-09-16T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39823"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-39823 (GCVE-0-2025-39823)

Vulnerability from cvelistv5

Published

2025-09-16 13:00

Modified

2025-09-29 06:00

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.

References

▼	URL	Tags
	https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48
	https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974
	https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12
	https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f
	https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69
	https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695
	https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb
	https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548

Impacted products

Vendor

Product

Version

▼

Linux

Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782

Linux

Version: 4.19

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/lapic.c",
            "arch/x86/kvm/x86.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48",
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              "version": "4180bf1b655a791a0a6ef93a2ffffc762722c782",
              "versionType": "git"
            },
            {
              "lessThan": "31a0ad2f60cb4816e06218b63e695eb72ce74974",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "d51e381beed5e2f50f85f49f6c90e023754efa12",
              "status": "affected",
              "version": "4180bf1b655a791a0a6ef93a2ffffc762722c782",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "f49161646e03d107ce81a99c6ca5da682fe5fb69",
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            },
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/lapic.c",
            "arch/x86/kvm/x86.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.298",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.242",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.150",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.298",
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                  "vulnerable": true
                },
                {
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                },
                {
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                  "versionStartIncluding": "4.19",
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                },
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                  "versionStartIncluding": "4.19",
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                },
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                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: use array_index_nospec with indices that come from guest\n\nmin and dest_id are guest-controlled indices. Using array_index_nospec()\nafter the bounds checks clamps these values to mitigate speculative execution\nside-channels."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:00:23.693Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974"
        },
        {
          "url": "https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12"
        },
        {
          "url": "https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69"
        },
        {
          "url": "https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695"
        },
        {
          "url": "https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548"
        }
      ],
      "title": "KVM: x86: use array_index_nospec with indices that come from guest",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39823",
    "datePublished": "2025-09-16T13:00:22.298Z",
    "dateReserved": "2025-04-16T07:20:57.139Z",
    "dateUpdated": "2025-09-29T06:00:23.693Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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