GHSA-G6F5-85J8-C4FR

Vulnerability from github – Published: 2025-09-16 15:32 – Updated: 2026-01-16 21:30
VLAI?
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.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-39823"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T13:16:00Z",
    "severity": "HIGH"
  },
  "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": "2026-01-16T21:30:27Z",
  "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"
    },
    {
      "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": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.