CVE-2026-72454

Estado: RecibidaAlta (7.8)—

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

i3c: mipi-i3c-hci: Fix race in i3c_hci_addr_to_dev()

i3c_hci_addr_to_dev() walks bus->devs.i3c, which is protected by bus.lock (rwsem). However, it is invoked from the MIPI I3C HCI IRQ handler, which cannot take bus.lock. This allows concurrent device addition/removal in the I3C core to modify the list while it is being traversed, potentially leading to use-after-free or crashes.

Remove the dependency on the bus device list and introduce a dedicated lookup table. Add an ibi_devs[] array indexed by DAT entry, maintained under hci->lock.

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Update the array when IBIs are enabled or disabled, so that it always reflects the set of devices allowed to generate IBIs. Also update when IBIs are freed, to cover the corner case when an IBI is freed without first being disabled (e.g. oldedev in i3c_master_add_i3c_dev_locked()).

Move i3c_hci_addr_to_dev() into core.c, reimplement it using the new array, and add a lockdep assertion to enforce that hci->lock is held by callers.

Demote a message in PIO and DMA IBI handling, from an error to a debug message, because there is a race window when the condition can arise normally.

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: 5
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 principalT1499.004 Application or System Exploitationimpact75 %

Acceso local (AV:L) sin interacción (UI:N) permite escalar privilegios explotando race condition en kernel Linux. Use-after-free causa DoS o corrupción de datos.

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 Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update 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 Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-72454",
  "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": "9ad9a52cce2828d932ae9495181e3d6414f72c07",
              "lessThan": "8f851cab401c28287d536b1347d76f6e219c0db6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9ad9a52cce2828d932ae9495181e3d6414f72c07",
              "lessThan": "650716f23eac488c6696babdc7805f6a6b7427ad",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/i3c/master/mipi-i3c-hci/core.c",
            "drivers/i3c/master/mipi-i3c-hci/dma.c",
            "drivers/i3c/master/mipi-i3c-hci/hci.h",
            "drivers/i3c/master/mipi-i3c-hci/ibi.h",
            "drivers/i3c/master/mipi-i3c-hci/pio.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/i3c/master/mipi-i3c-hci/core.c",
            "drivers/i3c/master/mipi-i3c-hci/dma.c",
            "drivers/i3c/master/mipi-i3c-hci/hci.h",
            "drivers/i3c/master/mipi-i3c-hci/ibi.h",
            "drivers/i3c/master/mipi-i3c-hci/pio.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:19.387",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/650716f23eac488c6696babdc7805f6a6b7427ad",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8f851cab401c28287d536b1347d76f6e219c0db6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: mipi-i3c-hci: Fix race in i3c_hci_addr_to_dev()\n\ni3c_hci_addr_to_dev() walks bus->devs.i3c, which is protected by\nbus.lock (rwsem).  However, it is invoked from the MIPI I3C HCI IRQ\nhandler, which cannot take bus.lock.  This allows concurrent device\naddition/removal in the I3C core to modify the list while it is being\ntraversed, potentially leading to use-after-free or crashes.\n\nRemove the dependency on the bus device list and introduce a dedicated\nlookup table.  Add an ibi_devs[] array indexed by DAT entry, maintained\nunder hci->lock.  Update the array when IBIs are enabled or disabled,\nso that it always reflects the set of devices allowed to generate IBIs.\nAlso update when IBIs are freed, to cover the corner case when an IBI is\nfreed without first being disabled (e.g. oldedev in\ni3c_master_add_i3c_dev_locked()).\n\nMove i3c_hci_addr_to_dev() into core.c, reimplement it using the new\narray, and add a lockdep assertion to enforce that hci->lock is held\nby callers.\n\nDemote a message in PIO and DMA IBI handling, from an error to a debug\nmessage, because there is a race window when the condition can arise\nnormally."
    }
  ],
  "lastModified": "2026-08-17T06:19:13.003",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}