FKIE_CVE-2025-39859

Vulnerability from fkie_nvd - Published: 2025-09-19 16:15 - Updated: 2026-10-21 13:18
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog The ptp_ocp_detach() only shuts down the watchdog timer if it is pending. However, if the timer handler is already running, the timer_delete_sync() is not called. This leads to race conditions where the devlink that contains the ptp_ocp is deallocated while the timer handler is still accessing it, resulting in use-after-free bugs. The following details one of the race scenarios. (thread 1) | (thread 2) ptp_ocp_remove() | ptp_ocp_detach() | ptp_ocp_watchdog() if (timer_pending(&bp->watchdog))| bp = timer_container_of() timer_delete_sync() | | devlink_free(devlink) //free | | bp-> //use Resolve this by unconditionally calling timer_delete_sync() to ensure the timer is reliably deactivated, preventing any access after free.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aad70bdfc8244616e48c434310cab241a3f17781
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2a6eabe5304a789b7d40ce2576cd80154255e51
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ptp/ptp_ocp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e2a6eabe5304a789b7d40ce2576cd80154255e51",
              "status": "affected",
              "version": "773bda96492153e11d21eb63ac814669b51fc701",
              "versionType": "git"
            },
            {
              "lessThan": "aad70bdfc8244616e48c434310cab241a3f17781",
              "status": "affected",
              "version": "773bda96492153e11d21eb63ac814669b51fc701",
              "versionType": "git"
            },
            {
              "lessThan": "f10d3c7267ac7387a5129d5506c3c5f2460cfd9b",
              "status": "affected",
              "version": "773bda96492153e11d21eb63ac814669b51fc701",
              "versionType": "git"
            },
            {
              "lessThan": "8bf935cf789872350b04c1a6468b0a509f67afb2",
              "status": "affected",
              "version": "773bda96492153e11d21eb63ac814669b51fc701",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/ptp/ptp_ocp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CD55C621-D0D0-413E-BDF3-3E801B2A2D54",
              "versionEndExcluding": "6.16.6",
              "versionStartIncluding": "5.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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(\u0026bp-\u003ewatchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //free       |\n                                     |   bp-\u003e //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nptp: ocp: corregir errores de uso despu\u00e9s de liberaci\u00f3n causados por ptp_ocp_watchdog\n\nLa funci\u00f3n ptp_ocp_detach() solo detiene el temporizador watchdog si est\u00e1 pendiente. Sin embargo, si el gestor del temporizador ya est\u00e1 en ejecuci\u00f3n, la funci\u00f3n timer_delete_sync() no es llamada. Esto lleva a condiciones de carrera donde el devlink que contiene el ptp_ocp es desasignado mientras el gestor del temporizador todav\u00eda lo est\u00e1 accediendo, lo que resulta en errores de uso despu\u00e9s de liberaci\u00f3n. A continuaci\u00f3n se detalla uno de los escenarios de carrera.\n\n(hilo 1)                           | (hilo 2)\nptp_ocp_remove()                     |\n  ptp_ocp_detach()                   | ptp_ocp_watchdog()\n    if (timer_pending(\u0026bp-\u003ewatchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //liberar       |\n                                     |   bp-\u003e //uso\n\nEsto se resuelve llamando incondicionalmente a timer_delete_sync() para asegurar que el temporizador sea desactivado de forma fiable, evitando cualquier acceso despu\u00e9s de la liberaci\u00f3n."
    }
  ],
  "id": "CVE-2025-39859",
  "lastModified": "2026-10-21T13:18:15.583",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-39859",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-01-14T19:22:59.022358Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-09-19T16:15:44.867",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aad70bdfc8244616e48c434310cab241a3f17781"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e2a6eabe5304a789b7d40ce2576cd80154255e51"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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