usb: early: xhci-dbc: Fix a potential out-of-bound memory access

{
  "id": "6caf771af7c09019535385e0c603ffc55b186b6e9fd6631dae13ed72d28dbcf8",
  "url": "https://osv.dev/vulnerability/CVE-2023-53840",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "usb: early: xhci-dbc: Fix a potential out-of-bound memory access",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: usb: early: xhci-dbc: Fix a potential out-of-bound memory access If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the string is not guaranteed to be NULL terminated when xdbc_trace() is called. Reserve an extra byte, which will be zeroed automatically because 'buf' is a static variable, in order to avoid troubles, should it happen.",
    "evidence": "osv:CVE-2023-53840",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.99",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53840",
      "aliases": [
        "CVE-2023-53840"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0"
                },
                {
                  "fixed": "e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0"
                },
                {
                  "fixed": "351c8d8650d1ccc006255fa01f98b6c6496a02e5"
                },
                {
                  "fixed": "df7c8aba7309f4dc55df94e06b67f576c0f52406"
                },
                {
                  "fixed": "a4a97ab3db5c081eb6e7dba91306adefb461e0bd"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53840.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.12.0"
                },
                {
                  "fixed": "5.15.99"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53840.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.976581313Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/351c8d8650d1ccc006255fa01f98b6c6496a02e5",
        "https://git.kernel.org/stable/c/a4a97ab3db5c081eb6e7dba91306adefb461e0bd",
        "https://git.kernel.org/stable/c/df7c8aba7309f4dc55df94e06b67f576c0f52406",
        "https://git.kernel.org/stable/c/e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53840.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53840",
        "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/2023/53xxx/CVE-2023-53840.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53840",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505419,
  "published_at": "2025-12-09T01:29:56.848+00:00"
}