usb: gadget: u_serial: Add null pointer check in gserial_suspend

{
  "id": "4c60b4c8aa95d492e17f44759141072e48411f7c29810cb6fa9d500c95a3b545",
  "url": "https://osv.dev/vulnerability/CVE-2023-53356",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "usb: gadget: u_serial: Add null pointer check in gserial_suspend",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Add null pointer check in gserial_suspend Consider a case where gserial_disconnect has already cleared gser->ioport. And if gserial_suspend gets called afterwards, it will lead to accessing of gser->ioport and thus causing null pointer dereference. Avoid this by adding a null pointer check. Added a static spinlock to prevent gser->ioport from becoming null after the newly added null pointer check.",
    "evidence": "osv:CVE-2023-53356",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.121",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-53356",
      "aliases": [
        "CVE-2023-53356"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "aba3a8d01d623a5efef48ab8e78752d58d4c90c3"
                },
                {
                  "fixed": "2788a3553f7497075653210b42e2aeb6ba95e28e"
                },
                {
                  "fixed": "a8ea7ed644cbf6314b5b0136b5398754b549fb8f"
                },
                {
                  "fixed": "e60a827ac074ce6bd58305fe5a86afab5fce6a04"
                },
                {
                  "fixed": "374447e3367767156405bedd230c5d391f4b7962"
                },
                {
                  "fixed": "2f6ecb89fe8feb2b60a53325b0eeb9866d88909a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53356.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.8.0"
                },
                {
                  "fixed": "5.10.188"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.121"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.39"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.4.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53356.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.008483676Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2788a3553f7497075653210b42e2aeb6ba95e28e",
        "https://git.kernel.org/stable/c/2f6ecb89fe8feb2b60a53325b0eeb9866d88909a",
        "https://git.kernel.org/stable/c/374447e3367767156405bedd230c5d391f4b7962",
        "https://git.kernel.org/stable/c/a8ea7ed644cbf6314b5b0136b5398754b549fb8f",
        "https://git.kernel.org/stable/c/e60a827ac074ce6bd58305fe5a86afab5fce6a04",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53356.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53356",
        "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-2023-53356.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53356",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509311,
  "published_at": "2025-09-17T14:56:46.113+00:00"
}