bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos

{
  "id": "fa49a48085ee022ce64f9de3e9b796c983866295dd5200480e0c605215f93ac7",
  "url": "https://osv.dev/vulnerability/CVE-2024-49850",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string \"0\" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.",
    "evidence": "osv:CVE-2024-49850",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.10.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-49850",
      "aliases": [
        "CVE-2024-49850"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "74753e1462e77349525daf9eb60ea21ed92d3a97"
                },
                {
                  "fixed": "dc7ce14f00bcd50641f2110b7a32aa6552e0780f"
                },
                {
                  "fixed": "2288b54b96dcb55bedebcef3572bb8821fc5e708"
                },
                {
                  "fixed": "584cd3ff792e1edbea20b2a7df55897159b0be3e"
                },
                {
                  "fixed": "e7e9c5b2dda29067332df2a85b0141a92b41f218"
                },
                {
                  "fixed": "3d2786d65aaa954ebd3fcc033ada433e10da21c4"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49850.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "6.1.113"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.10.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.11.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49850.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.073283567Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708",
        "https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4",
        "https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e",
        "https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f",
        "https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49850.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-49850",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49850.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-49850",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 512576,
  "published_at": "2024-10-21T12:18:44.098+00:00"
}