cve-2024-50253
Vulnerability from cvelistv5
Published
2024-11-09 10:15
Modified
2024-12-19 09:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the validity of nr_words in bpf_iter_bits_new() Check the validity of nr_words in bpf_iter_bits_new(). Without this check, when multiplication overflow occurs for nr_bits (e.g., when nr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur due to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008). Fix it by limiting the maximum value of nr_words to 511. The value is derived from the current implementation of BPF memory allocator. To ensure compatibility if the BPF memory allocator's size limitation changes in the future, use the helper bpf_mem_alloc_check_size() to check whether nr_bytes is too larger. And return -E2BIG instead of -ENOMEM for oversized nr_bytes.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/393397fbdcad7396639d7077c33f86169184ba99Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9539e09c67880ecd88b51188c346a2cc078b06cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 6.11
Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/helpers.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c9539e09c67880ecd88b51188c346a2cc078b06c",
              "status": "affected",
              "version": "4665415975b0827e9646cab91c61d02a6b364d59",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/helpers.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check the validity of nr_words in bpf_iter_bits_new()\n\nCheck the validity of nr_words in bpf_iter_bits_new(). Without this\ncheck, when multiplication overflow occurs for nr_bits (e.g., when\nnr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur\ndue to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008).\n\nFix it by limiting the maximum value of nr_words to 511. The value is\nderived from the current implementation of BPF memory allocator. To\nensure compatibility if the BPF memory allocator\u0027s size limitation\nchanges in the future, use the helper bpf_mem_alloc_check_size() to\ncheck whether nr_bytes is too larger. And return -E2BIG instead of\n-ENOMEM for oversized nr_bytes."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:36:36.711Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c9539e09c67880ecd88b51188c346a2cc078b06c"
        },
        {
          "url": "https://git.kernel.org/stable/c/393397fbdcad7396639d7077c33f86169184ba99"
        }
      ],
      "title": "bpf: Check the validity of nr_words in bpf_iter_bits_new()",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50253",
    "datePublished": "2024-11-09T10:15:06.891Z",
    "dateReserved": "2024-10-21T19:36:19.979Z",
    "dateUpdated": "2024-12-19T09:36:36.711Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50253\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-09T11:15:11.043\",\"lastModified\":\"2024-11-14T18:09:15.067\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Check the validity of nr_words in bpf_iter_bits_new()\\n\\nCheck the validity of nr_words in bpf_iter_bits_new(). Without this\\ncheck, when multiplication overflow occurs for nr_bits (e.g., when\\nnr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur\\ndue to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008).\\n\\nFix it by limiting the maximum value of nr_words to 511. The value is\\nderived from the current implementation of BPF memory allocator. To\\nensure compatibility if the BPF memory allocator\u0027s size limitation\\nchanges in the future, use the helper bpf_mem_alloc_check_size() to\\ncheck whether nr_bytes is too larger. And return -E2BIG instead of\\n-ENOMEM for oversized nr_bytes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: comprobar la validez de nr_words en bpf_iter_bits_new() Compruebe la validez de nr_words en bpf_iter_bits_new(). Sin esta comprobaci\u00f3n, cuando se produce un desbordamiento de multiplicaci\u00f3n para nr_bits (p. ej., cuando nr_words = 0x0400-0001, nr_bits se convierte en 64), puede producirse una corrupci\u00f3n de la pila debido a bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008). Solucione el problema limitando el valor m\u00e1ximo de nr_words a 511. El valor se deriva de la implementaci\u00f3n actual del asignador de memoria BPF. Para garantizar la compatibilidad si la limitaci\u00f3n de tama\u00f1o del asignador de memoria BPF cambia en el futuro, utilice el asistente bpf_mem_alloc_check_size() para verificar si nr_bytes es demasiado grande. Y devuelva -E2BIG en lugar de -ENOMEM para nr_bytes de gran tama\u00f1o.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.7\",\"matchCriteriaId\":\"386941FE-51A4-4893-9EC3-054AD3863E8D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0F717D8-3014-4F84-8086-0124B2111379\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"24DBE6C7-2AAE-4818-AED2-E131F153D2FA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/393397fbdcad7396639d7077c33f86169184ba99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c9539e09c67880ecd88b51188c346a2cc078b06c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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