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CVE-2026-93200

Estado: RecibidaSin puntuar—

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

i3c: master: Fix use-after-free of master->this

sysfs attribute callbacks for the master controller device dereference master->this. However, master->this is freed in i3c_master_detach_free_devs() before the master device itself is released.

As a result, sysfs accesses can dereference a freed master->this pointer, leading to a use-after-free.

Keep master->this alive until i3c_masterdev_release(), which is called after the master device and its sysfs state are being torn down. Do not free master->this as part of the normal device detach path.

Leer descripción completaMostrar menos

On the error path in i3c_master_set_info(), reset master->this and bus.cur_master to NULL before freeing the allocated device.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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).

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-2026-93200",
  "cveTags": [],
  "metrics": {},
  "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": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
              "lessThan": "23a1c4288a60e253a05a882bd8928ed61beb4a48",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
              "lessThan": "4f3145db05fede36b35f8249b8acde5bd5d54864",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
              "lessThan": "50034d8d0f797c3a7a599f750a7d3e792e80dea5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
              "lessThan": "feb0ed76601f3c2f91f08688c5a7d8b9d382f720",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/i3c/master.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/i3c/master.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:18:16.297",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/23a1c4288a60e253a05a882bd8928ed61beb4a48",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f3145db05fede36b35f8249b8acde5bd5d54864",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/50034d8d0f797c3a7a599f750a7d3e792e80dea5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/feb0ed76601f3c2f91f08688c5a7d8b9d382f720",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: Fix use-after-free of master->this\n\nsysfs attribute callbacks for the master controller device dereference\nmaster->this.  However, master->this is freed in\ni3c_master_detach_free_devs() before the master device itself is\nreleased.\n\nAs a result, sysfs accesses can dereference a freed master->this\npointer, leading to a use-after-free.\n\nKeep master->this alive until i3c_masterdev_release(), which is called\nafter the master device and its sysfs state are being torn down. Do not\nfree master->this as part of the normal device detach path.\n\nOn the error path in i3c_master_set_info(), reset master->this and\nbus.cur_master to NULL before freeing the allocated device."
    }
  ],
  "lastModified": "2026-10-03T11:17:46.447",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}