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CVE-2025-68822

Estado: AplazadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

Input: alps - fix use-after-free bugs caused by dev3_register_work

The dev3_register_work delayed work item is initialized within alps_reconnect() and scheduled upon receipt of the first bare PS/2 packet from an external PS/2 device connected to the ALPS touchpad. During device detachment, the original implementation calls flush_workqueue() in psmouse_disconnect() to ensure completion of dev3_register_work.

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However, the flush_workqueue() in psmouse_disconnect() only blocks and waits for work items that were already queued to the workqueue prior to its invocation. Any work items submitted after flush_workqueue() is called are not included in the set of tasks that the flush operation awaits. This means that after flush_workqueue() has finished executing, the dev3_register_work could still be scheduled. Although the psmouse state is set to PSMOUSE_CMD_MODE in psmouse_disconnect(), the scheduling of dev3_register_work remains unaffected.

The race condition can occur as follows:

Add disable_delayed_work_sync() in alps_disconnect() to ensure that dev3_register_work is properly canceled and prevented from executing after the alps_data structure has been deallocated.

This bug is identified by static analysis.

Detalles técnicos trazas, registros y código del informe original
CPU 0 (cleanup path)     | CPU 1 (delayed work)
psmouse_disconnect()     |
  psmouse_set_state()    |
  flush_workqueue()      | alps_report_bare_ps2_packet()
  alps_disconnect()      |   psmouse_queue_work()
    kfree(priv); // FREE | alps_register_bare_ps2_mouse()
                         |   priv = container_of(work...); // USE
                         |   priv->dev3 // USE

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de use-after-free en controlador de mouse ALPS del kernel Linux (AV:L, PR:L). Permite escalada de privilegios o DoS por corrupción de memoria. Acceso local con privilegios requeridos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-68822",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
              "lessThan": "ed8c61b89be0c45f029228b2913d5cf7b5cda1a7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
              "lessThan": "a9c115e017b2c633d25bdfe6709dda6fc36f08c2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
              "lessThan": "bf40644ef8c8a288742fa45580897ed0e0289474",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/input/mouse/alps.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/input/mouse/alps.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-01-13T16:16:04.550",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: alps - fix use-after-free bugs caused by dev3_register_work\n\nThe dev3_register_work delayed work item is initialized within\nalps_reconnect() and scheduled upon receipt of the first bare\nPS/2 packet from an external PS/2 device connected to the ALPS\ntouchpad. During device detachment, the original implementation\ncalls flush_workqueue() in psmouse_disconnect() to ensure\ncompletion of dev3_register_work. However, the flush_workqueue()\nin psmouse_disconnect() only blocks and waits for work items that\nwere already queued to the workqueue prior to its invocation. Any\nwork items submitted after flush_workqueue() is called are not\nincluded in the set of tasks that the flush operation awaits.\nThis means that after flush_workqueue() has finished executing,\nthe dev3_register_work could still be scheduled. Although the\npsmouse state is set to PSMOUSE_CMD_MODE in psmouse_disconnect(),\nthe scheduling of dev3_register_work remains unaffected.\n\nThe race condition can occur as follows:\n\nCPU 0 (cleanup path)     | CPU 1 (delayed work)\npsmouse_disconnect()     |\n  psmouse_set_state()    |\n  flush_workqueue()      | alps_report_bare_ps2_packet()\n  alps_disconnect()      |   psmouse_queue_work()\n    kfree(priv); // FREE | alps_register_bare_ps2_mouse()\n                         |   priv = container_of(work...); // USE\n                         |   priv->dev3 // USE\n\nAdd disable_delayed_work_sync() in alps_disconnect() to ensure\nthat dev3_register_work is properly canceled and prevented from\nexecuting after the alps_data structure has been deallocated.\n\nThis bug is identified by static analysis."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: alps - corrige errores de uso después de liberación causados por dev3_register_work\n\nEl elemento de trabajo retrasado dev3_register_work se inicializa dentro de alps_reconnect() y se programa al recibir el primer paquete PS/2 'bare' de un dispositivo PS/2 externo conectado al touchpad ALPS. Durante la desconexión del dispositivo, la implementación original llama a flush_workqueue() en psmouse_disconnect() para asegurar la finalización de dev3_register_work. Sin embargo, la flush_workqueue() en psmouse_disconnect() solo bloquea y espera por elementos de trabajo que ya estaban en cola en la workqueue antes de su invocación. Cualquier elemento de trabajo enviado después de que se llama a flush_workqueue() no se incluye en el conjunto de tareas que la operación de 'flush' espera. Esto significa que después de que flush_workqueue() ha terminado de ejecutarse, el dev3_register_work aún podría programarse. Aunque el estado de psmouse se establece en PSMOUSE_CMD_MODE en psmouse_disconnect(), la programación de dev3_register_work permanece inalterada.\n\nLa condición de carrera puede ocurrir de la siguiente manera:\n\nCPU 0 (ruta de limpieza) | CPU 1 (trabajo retrasado)\npsmouse_disconnect() |\n  psmouse_set_state() |\n  flush_workqueue() | alps_report_bare_ps2_packet()\n  alps_disconnect() |   psmouse_queue_work()\n    kfree(priv); // LIBERAR | alps_register_bare_ps2_mouse()\n                         |   priv = container_of(work...); // USAR\n                         |   priv->dev3 // USAR\n\nAñadir disable_delayed_work_sync() en alps_disconnect() para asegurar que dev3_register_work se cancele correctamente y se impida su ejecución después de que la estructura alps_data haya sido desasignada.\n\nEste error es identificado por análisis estático."
    }
  ],
  "lastModified": "2026-07-30T06:24:47.683",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}