CVE-2026-64421

Estado: AnalizadaAlta (7.8)—

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

media: nxp: imx8-isi: Fix use-after-free on remove

The problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup() before mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media entity pads, but the subsequent v4l2 cleanup still tries to remove media links that reference those pads.

Fix this by calling mxc_isi_v4l2_cleanup() before mxc_isi_crossbar_cleanup() to ensure all media entities are properly unregistered while the pads are still valid.

Detalles técnicos trazas, registros y código del informe original

KASAN reports a slab-use-after-free in __media_entity_remove_link()
during rmmod of imx8_isi:

  BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650
  Read of size 2 at addr ffff0000d47cb02a by task rmmod/724

  Call trace:
   __media_entity_remove_link+0x608/0x650
   __media_entity_remove_links+0x78/0x144
   __media_device_unregister_entity+0x150/0x280
   media_device_unregister_entity+0x48/0x68
   v4l2_device_unregister_subdev+0x158/0x300
   v4l2_async_unbind_subdev_one+0x22c/0x358
   v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0
   v4l2_async_nf_unregister+0x5c/0x14c
   mxc_isi_remove+0x124/0x2a0 [imx8_isi]

  Allocated by task 249:
   __kmalloc_noprof+0x27c/0x690
   mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi]

  Freed by task 724:
   kfree+0x1e4/0x5b0
   mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi]
   mxc_isi_remove+0x11c/0x2a0 [imx8_isi]

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: 0.17%
Percentil entre todas las CVEs puntuadas: 6
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 escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution45 %

Vulnerabilidad de use-after-free (CWE-416) en kernel Linux con acceso local (AV:L) y privilegios de usuario (PR:L). La pista sugiere impacto en ejecución de código, pero es especulativo: el defecto es un fallo de liberación de memoria en driver multimedia que podría permitir escalada de privilegios

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

{
  "id": "CVE-2026-64421",
  "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": "cf21f328fcafacf4f96e7a30ef9dceede1076378",
              "lessThan": "d22fb719654bfde6f682c9f14629f5f9534175b7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cf21f328fcafacf4f96e7a30ef9dceede1076378",
              "lessThan": "ba2aa5d325270cd965c44458c5ff5ab555e6af51",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cf21f328fcafacf4f96e7a30ef9dceede1076378",
              "lessThan": "ef382a6baf0a95cf199fdf6bba2fd08e58b0a249",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cf21f328fcafacf4f96e7a30ef9dceede1076378",
              "lessThan": "c12a5b2261351cd3b03921ce4720332ff5184b50",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cf21f328fcafacf4f96e7a30ef9dceede1076378",
              "lessThan": "b670bf89824ede5d07d20bb9bfbafb754846081d",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "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/media/platform/nxp/imx8-isi/imx8-isi-core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-25T10:17:26.097",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/b670bf89824ede5d07d20bb9bfbafb754846081d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ba2aa5d325270cd965c44458c5ff5ab555e6af51",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c12a5b2261351cd3b03921ce4720332ff5184b50",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d22fb719654bfde6f682c9f14629f5f9534175b7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ef382a6baf0a95cf199fdf6bba2fd08e58b0a249",
      "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\nmedia: nxp: imx8-isi: Fix use-after-free on remove\n\nKASAN reports a slab-use-after-free in __media_entity_remove_link()\nduring rmmod of imx8_isi:\n\n  BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650\n  Read of size 2 at addr ffff0000d47cb02a by task rmmod/724\n\n  Call trace:\n   __media_entity_remove_link+0x608/0x650\n   __media_entity_remove_links+0x78/0x144\n   __media_device_unregister_entity+0x150/0x280\n   media_device_unregister_entity+0x48/0x68\n   v4l2_device_unregister_subdev+0x158/0x300\n   v4l2_async_unbind_subdev_one+0x22c/0x358\n   v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0\n   v4l2_async_nf_unregister+0x5c/0x14c\n   mxc_isi_remove+0x124/0x2a0 [imx8_isi]\n\n  Allocated by task 249:\n   __kmalloc_noprof+0x27c/0x690\n   mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi]\n\n  Freed by task 724:\n   kfree+0x1e4/0x5b0\n   mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi]\n   mxc_isi_remove+0x11c/0x2a0 [imx8_isi]\n\nThe problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup()\nbefore mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media\nentity pads, but the subsequent v4l2 cleanup still tries to remove\nmedia links that reference those pads.\n\nFix this by calling mxc_isi_v4l2_cleanup() before\nmxc_isi_crossbar_cleanup() to ensure all media entities are properly\nunregistered while the pads are still valid."
    }
  ],
  "lastModified": "2026-09-04T15:16:38.903",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DB2F447B-DC5F-4A4E-9EB8-22D2664EEDFA",
              "versionEndExcluding": "6.6.145",
              "versionStartIncluding": "6.4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "05880CF6-5AD2-44E9-853A-6CE8318E76A5",
              "versionEndExcluding": "6.12.97",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "67D87928-1419-4529-9201-42C059678CB4",
              "versionEndExcluding": "6.18.40",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42",
              "versionEndExcluding": "7.1.4",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}