bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error

{
  "id": "386c8bd46f58fd39f852af0ba3b36c59e83552f39b49af4a09b638369af6bb59",
  "url": "https://osv.dev/vulnerability/CVE-2024-47728",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error For all non-tracing helpers which formerly had ARG_PTR_TO_{LONG,INT} as input arguments, zero the value for the case of an error as otherwise it could leak memory. For tracing, it is not needed given CAP_PERFMON can already read all kernel memory anyway hence bpf_get_func_arg() and bpf_get_func_ret() is skipped in here. Also, the MTU helpers mtu_len pointer value is being written but also read. Technically, the MEM_UNINIT should not be there in order to always force init. Removing MEM_UNINIT needs more verifier rework though: MEM_UNINIT right now implies two things actually: i) write into memory, ii) memory does not have to be initialized. If we lift MEM_UNINIT, it then becomes: i) read into memory, ii) memory must be initialized. This means that for bpf_*_check_mtu() we're readding the issue we're trying to fix, that is, it would then be able to write back into things like .rodata BPF maps. Follow-up work will rework the MEM_UNINIT semantics such that the intent can be better expressed. For now just clear the *mtu_len on error path which can be lifted later again.",
    "evidence": "osv:CVE-2024-47728",
    "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-2024-47728",
      "aliases": [
        "CVE-2024-47728"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d7a4cb9b6705a89937d12c8158a35a3145dc967a"
                },
                {
                  "fixed": "8397bf78988f3ae9dbebb0200189a62a57264980"
                },
                {
                  "fixed": "a634fa8e480ac2423f86311a602f6295df2c8ed0"
                },
                {
                  "fixed": "599d15b6d03356a97bff7a76155c5604c42a2962"
                },
                {
                  "fixed": "594a9f5a8d2de2573a856e506f77ba7dd2cefc6a"
                },
                {
                  "fixed": "4b3786a6c5397dc220b1483d8e2f4867743e966f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47728.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.2.0"
                },
                {
                  "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-2024-47728.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.636899613Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b3786a6c5397dc220b1483d8e2f4867743e966f",
        "https://git.kernel.org/stable/c/594a9f5a8d2de2573a856e506f77ba7dd2cefc6a",
        "https://git.kernel.org/stable/c/599d15b6d03356a97bff7a76155c5604c42a2962",
        "https://git.kernel.org/stable/c/8397bf78988f3ae9dbebb0200189a62a57264980",
        "https://git.kernel.org/stable/c/a634fa8e480ac2423f86311a602f6295df2c8ed0",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47728.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47728",
        "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/2024/47xxx/CVE-2024-47728.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-47728",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493170,
  "published_at": "2024-10-21T12:14:01.012+00:00"
}