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CVE-2026-64453

Estado: AnalizadaAlta (7.8)—

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

usb: misc: usbio: fix disconnect UAF in client teardown

usbio_disconnect() walks usbio->cli_list in reverse and uninitializes each auxiliary device. auxiliary_device_uninit() drops the device reference, and for an unbound child that can run usbio_auxdev_release() and free the containing struct usbio_client.

list_for_each_entry_reverse() advances after the loop body by reading client->link.prev. If the current client is freed by auxiliary_device_uninit(), the iterator dereferences freed memory.

Use list_for_each_entry_safe_reverse() so the previous client is cached before the body can drop the final reference. This preserves reverse teardown order while keeping the next iterator cursor independent of the current client's lifetime.

Detalles técnicos trazas, registros y código del informe original
Validation reproduced this kernel report:
BUG: KASAN: slab-use-after-free in usbio_disconnect+0x12e/0x150

Call Trace:
 <TASK>
 dump_stack_lvl+0x66/0xa0
 print_report+0xce/0x630
 ? usbio_disconnect+0x12e/0x150
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? __virt_addr_valid+0x188/0x320
 ? usbio_disconnect+0x12e/0x150
 kasan_report+0xe0/0x110
 ? usbio_disconnect+0x12e/0x150
 usbio_disconnect+0x12e/0x150
 usb_unbind_interface+0xf3/0x400
 really_probe+0x316/0x660
 __driver_probe_device+0x106/0x240
 driver_probe_device+0x4a/0x110
 __device_attach_driver+0xf1/0x1a0
 ? __pfx___device_attach_driver+0x10/0x10
 bus_for_each_drv+0xf9/0x160
 ? __pfx_bus_for_each_drv+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? trace_hardirqs_on+0x18/0x130
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? _raw_spin_unlock_irqrestore+0x44/0x60
 __device_attach+0x133/0x2a0
 ? __pfx___device_attach+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? do_raw_spin_unlock+0x9a/0x100
 ? srso_alias_return_thunk+0x5/0xfbef5
 device_initial_probe+0x55/0x70
 bus_probe_device+0x4a/0xd0
 device_add+0x9b9/0xc10
 ? __pfx_device_add+0x10/0x10
 ? _raw_spin_unlock_irqrestore+0x44/0x60
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? lockdep_hardirqs_on_prepare+0xea/0x1a0
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? usb_enable_lpm+0x3c/0x260
 usb_set_configuration+0xb64/0xf20
 usb_generic_driver_probe+0x5f/0x90
 usb_probe_device+0x71/0x1b0
 really_probe+0x46b/0x660
 __driver_probe_device+0x106/0x240
 driver_probe_device+0x4a/0x110
 __device_attach_driver+0xf1/0x1a0
 ? __pfx___device_attach_driver+0x10/0x10
 bus_for_each_drv+0xf9/0x160
 ? __pfx_bus_for_each_drv+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? trace_hardirqs_on+0x18/0x130
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? _raw_spin_unlock_irqrestore+0x44/0x60
 __device_attach+0x133/0x2a0
 ? __pfx___device_attach+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? do_raw_spin_unlock+0x9a/0x100
 ? srso_alias_return_thunk+0x5/0xfbef5
 device_initial_probe+0x55/0x70
 bus_probe_device+0x4a/0xd0
 device_add+0x9b9/0xc10
 ? __pfx_device_add+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? add_device_randomness+0xb7/0xf0
 usb_new_device+0x492/0x870
 hub_event+0x1b10/0x29c0
 ? __pfx_hub_event+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? lock_acquire+0x187/0x300
 ? process_one_work+0x475/0xb90
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? lock_release+0xc8/0x290
 ? srso_alias_return_thunk+0x5/0xfbef5
 process_one_work+0x4d7/0xb90
 ? __pfx_process_one_work+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? __list_add_valid_or_report+0x37/0xf0
 ? __pfx_hub_event+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 worker_thread+0x2d8/0x570
 ? __pfx_worker_thread+0x10/0x10
 kthread+0x1ad/0x1f0
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x3c9/0x540
 ? __pfx_ret_from_fork+0x10/0x10
 ? srso_alias_return_thunk+0x5/0xfbef5
 ? __switch_to+0x2e9/0x730
 ? __pfx_kthread+0x10/0x10
 ret_from_fork_asm+0x1a/0x30
 </TASK>

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.

Use-after-free (CWE-416) local con privilegios permite escalada o DoS del kernel. El acceso local con PR:L genera T1068. La ejecución de código tiene baja confianza por ser memoria kernel.

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 PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-64453",
  "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"
        },
        "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": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "lessThan": "c40090f8d19b415e2925b22be964b5d1f695666f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "lessThan": "1947b6411460d68b54b13c536961933166937d05",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "lessThan": "0bfeec21984fedd32987f4e4c0cde34b445af404",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/usb/misc/usbio.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/usb/misc/usbio.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-25T10:17:30.273",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0bfeec21984fedd32987f4e4c0cde34b445af404",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1947b6411460d68b54b13c536961933166937d05",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c40090f8d19b415e2925b22be964b5d1f695666f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "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: misc: usbio: fix disconnect UAF in client teardown\n\nusbio_disconnect() walks usbio->cli_list in reverse and uninitializes each\nauxiliary device. auxiliary_device_uninit() drops the device reference, and\nfor an unbound child that can run usbio_auxdev_release() and free the\ncontaining struct usbio_client.\n\nlist_for_each_entry_reverse() advances after the loop body by reading\nclient->link.prev. If the current client is freed by\nauxiliary_device_uninit(), the iterator dereferences freed memory.\n\nUse list_for_each_entry_safe_reverse() so the previous client is\ncached before the body can drop the final reference. This preserves\nreverse teardown order while keeping the next iterator cursor independent\nof the current client's lifetime.\n\nValidation reproduced this kernel report:\nBUG: KASAN: slab-use-after-free in usbio_disconnect+0x12e/0x150\n\nCall Trace:\n <TASK>\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x630\n ? usbio_disconnect+0x12e/0x150\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __virt_addr_valid+0x188/0x320\n ? usbio_disconnect+0x12e/0x150\n kasan_report+0xe0/0x110\n ? usbio_disconnect+0x12e/0x150\n usbio_disconnect+0x12e/0x150\n usb_unbind_interface+0xf3/0x400\n really_probe+0x316/0x660\n __driver_probe_device+0x106/0x240\n driver_probe_device+0x4a/0x110\n __device_attach_driver+0xf1/0x1a0\n ? __pfx___device_attach_driver+0x10/0x10\n bus_for_each_drv+0xf9/0x160\n ? __pfx_bus_for_each_drv+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? trace_hardirqs_on+0x18/0x130\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? _raw_spin_unlock_irqrestore+0x44/0x60\n __device_attach+0x133/0x2a0\n ? __pfx___device_attach+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? do_raw_spin_unlock+0x9a/0x100\n ? srso_alias_return_thunk+0x5/0xfbef5\n device_initial_probe+0x55/0x70\n bus_probe_device+0x4a/0xd0\n device_add+0x9b9/0xc10\n ? __pfx_device_add+0x10/0x10\n ? _raw_spin_unlock_irqrestore+0x44/0x60\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? lockdep_hardirqs_on_prepare+0xea/0x1a0\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? usb_enable_lpm+0x3c/0x260\n usb_set_configuration+0xb64/0xf20\n usb_generic_driver_probe+0x5f/0x90\n usb_probe_device+0x71/0x1b0\n really_probe+0x46b/0x660\n __driver_probe_device+0x106/0x240\n driver_probe_device+0x4a/0x110\n __device_attach_driver+0xf1/0x1a0\n ? __pfx___device_attach_driver+0x10/0x10\n bus_for_each_drv+0xf9/0x160\n ? __pfx_bus_for_each_drv+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? trace_hardirqs_on+0x18/0x130\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? _raw_spin_unlock_irqrestore+0x44/0x60\n __device_attach+0x133/0x2a0\n ? __pfx___device_attach+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? do_raw_spin_unlock+0x9a/0x100\n ? srso_alias_return_thunk+0x5/0xfbef5\n device_initial_probe+0x55/0x70\n bus_probe_device+0x4a/0xd0\n device_add+0x9b9/0xc10\n ? __pfx_device_add+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? add_device_randomness+0xb7/0xf0\n usb_new_device+0x492/0x870\n hub_event+0x1b10/0x29c0\n ? __pfx_hub_event+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? lock_acquire+0x187/0x300\n ? process_one_work+0x475/0xb90\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? lock_release+0xc8/0x290\n ? srso_alias_return_thunk+0x5/0xfbef5\n process_one_work+0x4d7/0xb90\n ? __pfx_process_one_work+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __list_add_valid_or_report+0x37/0xf0\n ? __pfx_hub_event+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n worker_thread+0x2d8/0x570\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x1ad/0x1f0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x3c9/0x540\n ? __pfx_ret_from_fork+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __switch_to+0x2e9/0x730\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>"
    }
  ],
  "lastModified": "2026-09-03T14:45:03.570",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CA2CE3BD-0548-4984-8C39-F3D3DF4D64E1",
              "versionEndExcluding": "6.18.39",
              "versionStartIncluding": "6.18"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42",
              "versionEndExcluding": "7.1.4",
              "versionStartIncluding": "6.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5E8B9085-7ADB-4A05-89EF-12949B6A0509"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1FC0D50D-9D58-4947-A197-A5A3FF07E7E3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}