{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-50253",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T20:15:44.047457Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:17:24.826Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "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"
            },
            {
              "lessThan": "393397fbdcad7396639d7077c33f86169184ba99",
              "status": "affected",
              "version": "4665415975b0827e9646cab91c61d02a6b364d59",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.7",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached by loading and running an eBPF program via the bpf(2) syscall, which requires local system access. Per kernel CNA guidance, BPF subsystem bugs are Local.\nAC:L - Triggering is fully deterministic \u2014 the attacker simply calls bpf_iter_bits_new() with nr_words = 0x04000001, requiring no race, no memory-layout grooming, and no non-default configuration. The kfunc is in the COMMON kfunc set, available to every BPF program type on any stock kernel with CONFIG_DEBUG_INFO_BTF.\nPR:L - Calling the kfunc requires bpf_capable(), which is satisfied by an unprivileged container process holding a delegated BPF token (bpffs delegate_cmds/delegate_progs grants ns_capable(CAP_BPF) inside a user namespace) or by any non-root CAP_BPF-only daemon such as a tracing/observability or Cilium-style agent. CAP_BPF is a deliberately non-root, delegable capability, so this is Low rather than High privilege.\nUI:N - The attacker loads and triggers its own BPF program end to end; no victim action, mount, or file open is involved.\nS:U - The corruption stays within the kernel\u0027s own security authority \u2014 this is a standard local kernel memory-corruption/privilege-escalation primitive with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The attacker supplies an arbitrary kernel source address whose contents are copied far past the 8-byte destination, and the resulting large-scale kernel memory corruption can be leveraged to disclose sensitive kernel data. Per guidance, out-of-bounds access of this magnitude is High.\nI:H - This is an unbounded out-of-bounds write of 512 MB to 3.5 GB starting at an 8-byte kernel-stack object, overwriting saved registers and return addresses with either attacker-chosen kernel memory contents or zeros; the commit itself states \"stack corruption may occur.\" Such corruption is exploitable for control-flow hijacking and, on non-VMAP_STACK builds, zeroes adjacent kernel structures including credentials.\nA:H - Even the failure path unconditionally executes memset(dst, 0, 512MB) over the kernel stack, so the frame is destroyed and the write runs into the VMAP_STACK guard page, guaranteeing an oops or panic. The attacker can repeat this at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:42:47.547Z",
        "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-1.2.0"
      }
    }
  },
  "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": "2026-08-05T11:42:47.547Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}