{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "26B700EE-A79C-4047-8214-099FACC0BEB5",
              "versionEndExcluding": "6.6.66",
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              "vulnerable": true
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncacheinfo: Allocate memory during CPU hotplug if not done from the primary CPU\n\nCommit\n\n  5944ce092b97 (\"arch_topology: Build cacheinfo from primary CPU\")\n\nadds functionality that architectures can use to optionally allocate and\nbuild cacheinfo early during boot. Commit\n\n  6539cffa9495 (\"cacheinfo: Add arch specific early level initializer\")\n\nlets secondary CPUs correct (and reallocate memory) cacheinfo data if\nneeded.\n\nIf the early build functionality is not used and cacheinfo does not need\ncorrection, memory for cacheinfo is never allocated. x86 does not use\nthe early build functionality. Consequently, during the cacheinfo CPU\nhotplug callback, last_level_cache_is_valid() attempts to dereference\na NULL pointer:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000100\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not present page\n  PGD 0 P4D 0\n  Oops: 0000 [#1] PREEPMT SMP NOPTI\n  CPU: 0 PID 19 Comm: cpuhp/0 Not tainted 6.4.0-rc2 #1\n  RIP: 0010: last_level_cache_is_valid+0x95/0xe0a\n\nAllocate memory for cacheinfo during the cacheinfo CPU hotplug callback\nif not done earlier.\n\nMoreover, before determining the validity of the last-level cache info,\nensure that it has been allocated. Simply checking for non-zero\ncache_leaves() is not sufficient, as some architectures (e.g., Intel\nprocessors) have non-zero cache_leaves() before allocation.\n\nDereferencing NULL cacheinfo can occur in update_per_cpu_data_slice_size().\nThis function iterates over all online CPUs. However, a CPU may have come\nonline recently, but its cacheinfo may not have been allocated yet.\n\nWhile here, remove an unnecessary indentation in allocate_cache_info().\n\n  [ bp: Massage. ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cacheinfo: Asignar memoria durante la conexi\u00f3n en caliente de la CPU si no se hace desde la CPU principal. el commit 5944ce092b97 (\"arch_topology: Generar cacheinfo desde la CPU principal\") a\u00f1ade una funcionalidad que las arquitecturas pueden utilizar para asignar y generar opcionalmente cacheinfo de forma temprana durante el arranque. el commit 6539cffa9495 (\"cacheinfo: A\u00f1adir inicializador de nivel temprano espec\u00edfico de la arquitectura\") permite que las CPU secundarias corrijan (y reasignen memoria) los datos de cacheinfo si es necesario. Si no se utiliza la funcionalidad de generaci\u00f3n temprana y cacheinfo no necesita correcci\u00f3n, nunca se asigna memoria para cacheinfo. x86 no utiliza la funcionalidad de generaci\u00f3n temprana. En consecuencia, durante la devoluci\u00f3n de llamada hotplug de CPU de cacheinfo, last_level_cache_is_valid() intenta desreferenciar un puntero NULL: BUG: kernel NULL pointer dereference, address: 0000000000000100 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not present page PGD 0 P4D 0 Oops: 0000 [#1] PREEPMT SMP NOPTI CPU: 0 PID 19 Comm: cpuhp/0 Not tainted 6.4.0-rc2 #1 RIP: 0010: last_level_cache_is_valid+0x95/0xe0a Asigne memoria para cacheinfo durante la devoluci\u00f3n de llamada hotplug de CPU de cacheinfo si no se hizo antes. Adem\u00e1s, antes de determinar la validez de la informaci\u00f3n de cach\u00e9 de \u00faltimo nivel, aseg\u00farese de que se haya asignado. No basta con comprobar si hay cache_leaves() distintos de cero, ya que algunas arquitecturas (por ejemplo, los procesadores Intel) tienen cache_leaves() distintos de cero antes de la asignaci\u00f3n. La anulaci\u00f3n de referencias a cacheinfo NULL puede ocurrir en update_per_cpu_data_slice_size(). Esta funci\u00f3n itera sobre todas las CPU en l\u00ednea. Sin embargo, es posible que una CPU se haya conectado recientemente, pero que su cacheinfo a\u00fan no se haya asignado. Mientras est\u00e9 aqu\u00ed, elimine una sangr\u00eda innecesaria en allocate_cache_info(). [ bp: Masaje. ]"
    }
  ],
  "id": "CVE-2024-56617",
  "lastModified": "2025-01-16T16:13:18.913",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-12-27T15:15:21.227",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/23b5908b11b77ff8d7b8f7b8f11cbab2e1f4bfc2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/95e197354e0de07e9a20819bdae6562e4dda0f20"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b3fce429a1e030b50c1c91351d69b8667eef627b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}