net: nfc: nci: Add parameter validation for packet data

{
  "id": "fe115f9b3f272cfd42641a55e6ab970ec495936c814c8c0b61d6936bdf02f2d5",
  "url": "https://osv.dev/vulnerability/CVE-2025-40043",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: nfc: nci: Add parameter validation for packet data",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: nfc: nci: Add parameter validation for packet data Syzbot reported an uninitialized value bug in nci_init_req, which was introduced by commit 5aca7966d2a7 (\"Merge tag 'perf-tools-fixes-for-v6.17-2025-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools\"). This bug arises due to very limited and poor input validation that was done at nic_valid_size(). This validation only validates the skb->len (directly reflects size provided at the userspace interface) with the length provided in the buffer itself (interpreted as NCI_HEADER). This leads to the processing of memory content at the address assuming the correct layout per what opcode requires there. This leads to the accesses to buffer of `skb_buff->data` which is not assigned anything yet. Following the same silent drop of packets of invalid sizes at `nic_valid_size()`, add validation of the data in the respective handlers and return error values in case of failure. Release the skb if error values are returned from handlers in `nci_nft_packet` and effectively do a silent drop Possible TODO: because we silently drop the packets, the call to `nci_request` will be waiting for completion of request and will face timeouts. These timeouts can get excessively logged in the dmesg. A proper handling of them may require to export `nci_request_cancel` (or propagate error handling from the nft packets handlers).",
    "evidence": "osv:CVE-2025-40043",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.195",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.156",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-40043",
      "aliases": [
        "CVE-2025-40043"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6a2968aaf50c7a22fced77a5e24aa636281efca8"
                },
                {
                  "fixed": "8fcc7315a10a84264e55bb65ede10f0af20a983f"
                },
                {
                  "fixed": "bfdda0123dde406dbff62e7e9136037e97998a15"
                },
                {
                  "fixed": "0ba68bea1e356f466ad29449938bea12f5f3711f"
                },
                {
                  "fixed": "74837bca0748763a77f77db47a0bdbe63b347628"
                },
                {
                  "fixed": "c395d1e548cc68e84584ffa2e3ca9796a78bf7b9"
                },
                {
                  "fixed": "9c328f54741bd5465ca1dc717c84c04242fac2e1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40043.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.2.0"
                },
                {
                  "fixed": "5.15.195"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.156"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40043.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.711461041Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0ba68bea1e356f466ad29449938bea12f5f3711f",
        "https://git.kernel.org/stable/c/74837bca0748763a77f77db47a0bdbe63b347628",
        "https://git.kernel.org/stable/c/8fcc7315a10a84264e55bb65ede10f0af20a983f",
        "https://git.kernel.org/stable/c/9c328f54741bd5465ca1dc717c84c04242fac2e1",
        "https://git.kernel.org/stable/c/bfdda0123dde406dbff62e7e9136037e97998a15",
        "https://git.kernel.org/stable/c/c395d1e548cc68e84584ffa2e3ca9796a78bf7b9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40043.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40043",
        "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/2025/40xxx/CVE-2025-40043.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40043",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492531,
  "published_at": "2025-10-28T11:48:22.23+00:00"
}