{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53356",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53356"
  ],
  "published": "2025-09-17T14:57:20Z",
  "summary": "usb: gadget: u_serial: Add null pointer check in gserial_suspend",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Add null pointer check in gserial_suspend\n\nConsider a case where gserial_disconnect has already cleared\ngser->ioport. And if gserial_suspend gets called afterwards,\nit will lead to accessing of gser->ioport and thus causing\nnull pointer dereference.\n\nAvoid this by adding a null pointer check. Added a static\nspinlock to prevent gser->ioport from becoming null after\nthe newly added null pointer check.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.39"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53356"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2788a3553f7497075653210b42e2aeb6ba95e28e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a8ea7ed644cbf6314b5b0136b5398754b549fb8f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e60a827ac074ce6bd58305fe5a86afab5fce6a04"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/374447e3367767156405bedd230c5d391f4b7962"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f6ecb89fe8feb2b60a53325b0eeb9866d88909a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}