CVE-2022-49980

Estado: AnalizadaAlta (7.8)—

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

USB: gadget: Fix use-after-free Read in usb_udc_uevent()

The syzbot fuzzer found a race between uevent callbacks and gadget driver unregistration that can cause a use-after-free bug:

The bug occurs because usb_udc_uevent() dereferences udc->driver but does so without acquiring the udc_lock mutex, which protects this field. If the gadget driver is unbound from the udc concurrently with uevent processing, the driver structure may be accessed after it has been deallocated.

To prevent the race, we make sure that the routine holds the mutex around the racing accesses.

Detalles técnicos trazas, registros y código del informe original

---------------------------------------------------------------
BUG: KASAN: use-after-free in usb_udc_uevent+0x11f/0x130
drivers/usb/gadget/udc/core.c:1732
Read of size 8 at addr ffff888078ce2050 by task udevd/2968

CPU: 1 PID: 2968 Comm: udevd Not tainted 5.19.0-rc4-next-20220628-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google
06/29/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
 usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1732
 dev_uevent+0x290/0x770 drivers/base/core.c:2424
---------------------------------------------------------------

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.24%
Percentil entre todas las CVEs puntuadas: 13
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution70 %

CVE-2022-49980 es un use-after-free (CWE-416) en controlador USB local que requiere PR:L (privilegios locales) sin UI:N. Permite lectura/escritura de memoria kernel, permitiendo ejecución de código o escalada de privilegios desde contexto privilegiado.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2022-49980",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
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          "defaultStatus": "unaffected"
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        {
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            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.1",
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            {
              "status": "unaffected",
              "version": "5.19.7",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/usb/gadget/udc/core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:25.480",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2191c00855b03aa59c20e698be713d952d51fc18",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: Fix use-after-free Read in usb_udc_uevent()\n\nThe syzbot fuzzer found a race between uevent callbacks and gadget\ndriver unregistration that can cause a use-after-free bug:\n\n---------------------------------------------------------------\nBUG: KASAN: use-after-free in usb_udc_uevent+0x11f/0x130\ndrivers/usb/gadget/udc/core.c:1732\nRead of size 8 at addr ffff888078ce2050 by task udevd/2968\n\nCPU: 1 PID: 2968 Comm: udevd Not tainted 5.19.0-rc4-next-20220628-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google\n06/29/2022\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:317 [inline]\n print_report.cold+0x2ba/0x719 mm/kasan/report.c:433\n kasan_report+0xbe/0x1f0 mm/kasan/report.c:495\n usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1732\n dev_uevent+0x290/0x770 drivers/base/core.c:2424\n---------------------------------------------------------------\n\nThe bug occurs because usb_udc_uevent() dereferences udc->driver but\ndoes so without acquiring the udc_lock mutex, which protects this\nfield.  If the gadget driver is unbound from the udc concurrently with\nuevent processing, the driver structure may be accessed after it has\nbeen deallocated.\n\nTo prevent the race, we make sure that the routine holds the mutex\naround the racing accesses."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: USB: gadget: Corrección de lectura de Use-After-Free en usb_udc_uevent() El analizador de vulnerabilidades syzbot encontró una ejecución entre las devoluciones de llamadas de uevent y la anulación del registro del controlador del gadget que puede causar un error de Use-After-Free: --------------------------------------------------------------- ERROR: KASAN: Use-After-Free en usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1732 Lectura de tamaño 8 en la dirección ffff888078ce2050 por la tarea udevd/2968 CPU: 1 PID: 2968 Comm: udevd No contaminado 5.19.0-rc4-next-20220628-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 29/06/2022 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495 usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1732 dev_uevent+0x290/0x770 drivers/base/core.c:2424 --------------------------------------------------------------- El error ocurre porque usb_udc_uevent() desreferencia udc-&gt;driver pero lo hace sin adquirir el Mutex udc_lock, que protege este campo. Si el controlador del gadget se desvincula del udc simultáneamente con el procesamiento de uevent, se puede acceder a la estructura del controlador después de su desasignación. Para evitar la competencia, nos aseguramos de que la rutina mantenga el mutex en los accesos de competencia."
    }
  ],
  "lastModified": "2026-06-17T05:19:40.303",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6A68E1F8-6957-46BF-A921-09842AEFCA7C",
              "versionEndExcluding": "5.19.7"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}