{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39859",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-39859"
  ],
  "published": "2025-09-19T15:28:22Z",
  "summary": "ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog\n\nThe ptp_ocp_detach() only shuts down the watchdog timer if it is\npending. However, if the timer handler is already running, the\ntimer_delete_sync() is not called. This leads to race conditions\nwhere the devlink that contains the ptp_ocp is deallocated while\nthe timer handler is still accessing it, resulting in use-after-free\nbugs. The following details one of the race scenarios.\n\n(thread 1)                           | (thread 2)\nptp_ocp_remove()                     |\n  ptp_ocp_detach()                   | ptp_ocp_watchdog()\n    if (timer_pending(&bp->watchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //free       |\n                                     |   bp-> //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39859"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}