{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-54277",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-54277"
  ],
  "published": "2025-12-30T12:20:26Z",
  "summary": "fbdev: udlfb: Fix endpoint check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: udlfb: Fix endpoint check\n\nThe syzbot fuzzer detected a problem in the udlfb driver, caused by an\nendpoint not having the expected type:\n\nusb 1-1: Read EDID byte 0 failed: -71\nusb 1-1: Unable to get valid EDID from device/display\n------------[ cut here ]------------\nusb 1-1: BOGUS urb xfer, pipe 3 != type 1\nWARNING: CPU: 0 PID: 9 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880\ndrivers/usb/core/urb.c:504\nModules linked in:\nCPU: 0 PID: 9 Comm: kworker/0:1 Not tainted\n6.4.0-rc1-syzkaller-00016-ga4422ff22142 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google\n04/28/2023\nWorkqueue: usb_hub_wq hub_event\nRIP: 0010:usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504\n...\nCall Trace:\n <TASK>\n dlfb_submit_urb+0x92/0x180 drivers/video/fbdev/udlfb.c:1980\n dlfb_set_video_mode+0x21f0/0x2950 drivers/video/fbdev/udlfb.c:315\n dlfb_ops_set_par+0x2a7/0x8d0 drivers/video/fbdev/udlfb.c:1111\n dlfb_usb_probe+0x149a/0x2710 drivers/video/fbdev/udlfb.c:1743\n\nThe current approach for this issue failed to catch the problem\nbecause it only checks for the existence of a bulk-OUT endpoint; it\ndoesn't check whether this endpoint is the one that the driver will\nactually use.\n\nWe can fix the problem by instead checking that the endpoint used by\nthe driver does exist and is bulk-OUT.",
  "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": "6.1.31"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-54277"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1522dc58bff87af79461b96d90ec122e9e726004"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/58ecc165abdaed85447455e6dc396758e8c6f219"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e12c58a5ece41be72157cef348576b135c9fc72"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c8fdf7feca77cd99e25ef0a1e9e72dfc83add8ef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e19383e5dee5adbf3d19f3f210f440a88d1b7dde"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed9de4ed39875706607fb08118a58344ae6c5f42"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
  }
}