CVE-2025-21840 (GCVE-0-2025-21840)
Vulnerability from cvelistv5
Published
2025-03-07 09:09
Modified
2025-05-04 07:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header The intel-lpmd tool [1], which uses the THERMAL_GENL_ATTR_CPU_CAPABILITY attribute to receive HFI events from kernel space, encounters a segmentation fault after commit 1773572863c4 ("thermal: netlink: Add the commands and the events for the thresholds"). The issue arises because the THERMAL_GENL_ATTR_CPU_CAPABILITY raw value was changed while intel_lpmd still uses the old value. Although intel_lpmd can be updated to check the THERMAL_GENL_VERSION and use the appropriate THERMAL_GENL_ATTR_CPU_CAPABILITY value, the commit itself is questionable. The commit introduced a new element in the middle of enum thermal_genl_attr, which affects many existing attributes and introduces potential risks and unnecessary maintenance burdens for userspace thermal netlink event users. Solve the issue by moving the newly introduced THERMAL_GENL_ATTR_TZ_PREV_TEMP attribute to the end of the enum thermal_genl_attr. This ensures that all existing thermal generic netlink attributes remain unaffected. [ rjw: Subject edits ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 1773572863c43a14a3e45f0591f28b7dec1ee52a
Version: 1773572863c43a14a3e45f0591f28b7dec1ee52a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/uapi/linux/thermal.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3a4ca365c51729143a2cab693cd40fe0bb585ef0",
              "status": "affected",
              "version": "1773572863c43a14a3e45f0591f28b7dec1ee52a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1773572863c43a14a3e45f0591f28b7dec1ee52a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/uapi/linux/thermal.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.4",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header\n\nThe intel-lpmd tool [1], which uses the THERMAL_GENL_ATTR_CPU_CAPABILITY\nattribute to receive HFI events from kernel space, encounters a\nsegmentation fault after commit 1773572863c4 (\"thermal: netlink: Add the\ncommands and the events for the thresholds\").\n\nThe issue arises because the THERMAL_GENL_ATTR_CPU_CAPABILITY raw value\nwas changed while intel_lpmd still uses the old value.\n\nAlthough intel_lpmd can be updated to check the THERMAL_GENL_VERSION and\nuse the appropriate THERMAL_GENL_ATTR_CPU_CAPABILITY value, the commit\nitself is questionable.\n\nThe commit introduced a new element in the middle of enum thermal_genl_attr,\nwhich affects many existing attributes and introduces potential risks\nand unnecessary maintenance burdens for userspace thermal netlink event\nusers.\n\nSolve the issue by moving the newly introduced\nTHERMAL_GENL_ATTR_TZ_PREV_TEMP attribute to the end of the\nenum thermal_genl_attr. This ensures that all existing thermal generic\nnetlink attributes remain unaffected.\n\n[ rjw: Subject edits ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:22:19.691Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3a4ca365c51729143a2cab693cd40fe0bb585ef0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c195b9c6ab9c383d7aa3f4a65879b3ca90cb378b"
        }
      ],
      "title": "thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21840",
    "datePublished": "2025-03-07T09:09:58.907Z",
    "dateReserved": "2024-12-29T08:45:45.777Z",
    "dateUpdated": "2025-05-04T07:22:19.691Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21840\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-07T09:15:17.033\",\"lastModified\":\"2025-03-07T09:15:17.033\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nthermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header\\n\\nThe intel-lpmd tool [1], which uses the THERMAL_GENL_ATTR_CPU_CAPABILITY\\nattribute to receive HFI events from kernel space, encounters a\\nsegmentation fault after commit 1773572863c4 (\\\"thermal: netlink: Add the\\ncommands and the events for the thresholds\\\").\\n\\nThe issue arises because the THERMAL_GENL_ATTR_CPU_CAPABILITY raw value\\nwas changed while intel_lpmd still uses the old value.\\n\\nAlthough intel_lpmd can be updated to check the THERMAL_GENL_VERSION and\\nuse the appropriate THERMAL_GENL_ATTR_CPU_CAPABILITY value, the commit\\nitself is questionable.\\n\\nThe commit introduced a new element in the middle of enum thermal_genl_attr,\\nwhich affects many existing attributes and introduces potential risks\\nand unnecessary maintenance burdens for userspace thermal netlink event\\nusers.\\n\\nSolve the issue by moving the newly introduced\\nTHERMAL_GENL_ATTR_TZ_PREV_TEMP attribute to the end of the\\nenum thermal_genl_attr. This ensures that all existing thermal generic\\nnetlink attributes remain unaffected.\\n\\n[ rjw: Subject edits ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: thermal/netlink: Prevenir un error de segmentaci\u00f3n del espacio de usuario ajustando el encabezado UAPI La herramienta intel-lpmd [1], que utiliza el atributo THERMAL_GENL_ATTR_CPU_CAPABILITY para recibir eventos HFI desde el espacio del kernel, encuentra un error de segmentaci\u00f3n despu\u00e9s de el commit 1773572863c4 (\\\"thermal: netlink: Agregar los comandos y los eventos para los umbrales\\\"). El problema surge porque se cambi\u00f3 el valor sin procesar de THERMAL_GENL_ATTR_CPU_CAPABILITY mientras que intel_lpmd todav\u00eda usa el valor anterior. Aunque intel_lpmd se puede actualizar para verificar THERMAL_GENL_VERSION y usar el valor THERMAL_GENL_ATTR_CPU_CAPABILITY apropiado, el commit en s\u00ed es cuestionable. El commit introdujo un nuevo elemento en el medio de la enumeraci\u00f3n thermal_genl_attr, que afecta a muchos atributos existentes e introduce riesgos potenciales y cargas de mantenimiento innecesarias para los usuarios del evento de enlace de red t\u00e9rmico del espacio de usuario. Resuelva el problema moviendo el atributo THERMAL_GENL_ATTR_TZ_PREV_TEMP recientemente introducido al final de la enumeraci\u00f3n thermal_genl_attr. Esto garantiza que todos los atributos de enlace de red gen\u00e9ricos t\u00e9rmicos existentes permanezcan inalterados. [ rjw: Ediciones del sujeto ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a4ca365c51729143a2cab693cd40fe0bb585ef0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c195b9c6ab9c383d7aa3f4a65879b3ca90cb378b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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