CVE-2025-39823 (GCVE-0-2025-39823)
Vulnerability from cvelistv5
Published
2025-09-16 13:00
Modified
2025-09-16 13:00
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb
Impacted products
Vendor Product Version
Linux Linux Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
Version: 4180bf1b655a791a0a6ef93a2ffffc762722c782
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   Linux Linux Version: 4.19
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/lapic.c",
            "arch/x86/kvm/x86.c"
          ],
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          "vendor": "Linux",
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
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            },
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            },
            {
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.17-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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": "2025-09-16T13:00:22.298Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548"
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      ],
      "title": "KVM: x86: use array_index_nospec with indices that come from guest",
      "x_generator": {
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  "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": "2025-09-16T13:00:22.298Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39823\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T13:16:00.397\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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