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CVE-2026-23348

Estado: AnalizadaMedia (4.7)—

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

cxl: Fix race of nvdimm_bus object when creating nvdimm objects

Found issue during running of cxl-translate.sh unit test. Adding a 3s sleep right before the test seems to make the issue reproduce fairly consistently. The cxl_translate module has dependency on cxl_acpi and causes orphaned nvdimm objects to reprobe after cxl_acpi is removed. The nvdimm_bus object is registered by the cxl_nvb object when cxl_acpi_probe() is called. With the nvdimm_bus object missing, __nd_device_register() will trigger NULL pointer dereference when accessing the dev->parent that points to &nvdimm_bus->dev.

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This patch also relies on the previous change where devm_cxl_add_nvdimm_bridge() is called from drivers/cxl/pmem.c instead of drivers/cxl/core.c to ensure the dependency of cxl_acpi on cxl_pmem.

The removal of cxl_nvdimm devices should prevent any orphaned devices from probing once the nvdimm_bus is gone.

[ dj: Fixed 0-day reported kdoc issue. ] [ dj: Fix cxl_nvb reference leak on error. Gregory (kreview-0811365) ]

Detalles técnicos trazas, registros y código del informe original
[  192.884510] BUG: kernel NULL pointer dereference, address: 000000000000006c
[  192.895383] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20250812-19.fc42 08/12/2025
[  192.897721] Workqueue: cxl_port cxl_bus_rescan_queue [cxl_core]
[  192.899459] RIP: 0010:kobject_get+0xc/0x90
[  192.924871] Call Trace:
[  192.925959]  <TASK>
[  192.926976]  ? pm_runtime_init+0xb9/0xe0
[  192.929712]  __nd_device_register.part.0+0x4d/0xc0 [libnvdimm]
[  192.933314]  __nvdimm_create+0x206/0x290 [libnvdimm]
[  192.936662]  cxl_nvdimm_probe+0x119/0x1d0 [cxl_pmem]
[  192.940245]  cxl_bus_probe+0x1a/0x60 [cxl_core]
[  192.943349]  really_probe+0xde/0x380

1. Set probe_type of cxl_nvb to PROBE_FORCE_SYNCHRONOUS to ensure the
   driver is probed synchronously when add_device() is called.
2. Add a check in __devm_cxl_add_nvdimm_bridge() to ensure that the
   cxl_nvb driver is attached during cxl_acpi_probe().
3. Take the cxl_root uport_dev lock and the cxl_nvb->dev lock in
   devm_cxl_add_nvdimm() before checking nvdimm_bus is valid.
4. Set cxl_nvdimm flag to CXL_NVD_F_INVALIDATED so cxl_nvdimm_probe()
   will exit with -EBUSY.

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23348",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
      }
    ]
  },
  "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": "8fdcb1704f61a8fd9be0f3849a174d084def0666",
              "lessThan": "5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7",
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              "version": "6.18.17",
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              "version": "6.19.7",
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  "published": "2026-03-25T11:16:33.050",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl: Fix race of nvdimm_bus object when creating nvdimm objects\n\nFound issue during running of cxl-translate.sh unit test. Adding a 3s\nsleep right before the test seems to make the issue reproduce fairly\nconsistently. The cxl_translate module has dependency on cxl_acpi and\ncauses orphaned nvdimm objects to reprobe after cxl_acpi is removed.\nThe nvdimm_bus object is registered by the cxl_nvb object when\ncxl_acpi_probe() is called. With the nvdimm_bus object missing,\n__nd_device_register() will trigger NULL pointer dereference when\naccessing the dev->parent that points to &nvdimm_bus->dev.\n\n[  192.884510] BUG: kernel NULL pointer dereference, address: 000000000000006c\n[  192.895383] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20250812-19.fc42 08/12/2025\n[  192.897721] Workqueue: cxl_port cxl_bus_rescan_queue [cxl_core]\n[  192.899459] RIP: 0010:kobject_get+0xc/0x90\n[  192.924871] Call Trace:\n[  192.925959]  <TASK>\n[  192.926976]  ? pm_runtime_init+0xb9/0xe0\n[  192.929712]  __nd_device_register.part.0+0x4d/0xc0 [libnvdimm]\n[  192.933314]  __nvdimm_create+0x206/0x290 [libnvdimm]\n[  192.936662]  cxl_nvdimm_probe+0x119/0x1d0 [cxl_pmem]\n[  192.940245]  cxl_bus_probe+0x1a/0x60 [cxl_core]\n[  192.943349]  really_probe+0xde/0x380\n\nThis patch also relies on the previous change where\ndevm_cxl_add_nvdimm_bridge() is called from drivers/cxl/pmem.c instead\nof drivers/cxl/core.c to ensure the dependency of cxl_acpi on cxl_pmem.\n\n1. Set probe_type of cxl_nvb to PROBE_FORCE_SYNCHRONOUS to ensure the\n   driver is probed synchronously when add_device() is called.\n2. Add a check in __devm_cxl_add_nvdimm_bridge() to ensure that the\n   cxl_nvb driver is attached during cxl_acpi_probe().\n3. Take the cxl_root uport_dev lock and the cxl_nvb->dev lock in\n   devm_cxl_add_nvdimm() before checking nvdimm_bus is valid.\n4. Set cxl_nvdimm flag to CXL_NVD_F_INVALIDATED so cxl_nvdimm_probe()\n   will exit with -EBUSY.\n\nThe removal of cxl_nvdimm devices should prevent any orphaned devices\nfrom probing once the nvdimm_bus is gone.\n\n[ dj: Fixed 0-day reported kdoc issue. ]\n[ dj: Fix cxl_nvb reference leak on error. Gregory (kreview-0811365) ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncxl: Corrige la condición de carrera del objeto nvdimm_bus al crear objetos nvdimm\n\nSe encontró el problema durante la ejecución de la prueba unitaria cxl-translate.sh. Añadir un retardo de 3s justo antes de la prueba parece hacer que el problema se reproduzca de forma bastante consistente. El módulo cxl_translate tiene una dependencia de cxl_acpi y provoca que los objetos nvdimm huérfanos se vuelvan a sondear después de que se elimine cxl_acpi. El objeto nvdimm_bus es registrado por el objeto cxl_nvb cuando se llama a cxl_acpi_probe(). Al faltar el objeto nvdimm_bus, __nd_device_register() activará una desreferencia de puntero NULL al acceder a dev-&gt;parent que apunta a &amp;nvdimm_bus-&gt;dev.\n\n[ 192.884510] BUG: desreferencia de puntero NULL del kernel, dirección: 000000000000006c\n[ 192.895383] Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20250812-19.fc42 08/12/2025\n[ 192.897721] Cola de trabajo: cxl_port cxl_bus_rescan_queue [cxl_core]\n[ 192.899459] RIP: 0010:kobject_get+0xc/0x90\n[ 192.924871] Traza de llamada:\n[ 192.925959] \n[ 192.926976] ? pm_runtime_init+0xb9/0xe0\n[ 192.929712] __nd_device_register.part.0+0x4d/0xc0 [libnvdimm]\n[ 192.933314] __nvdimm_create+0x206/0x290 [libnvdimm]\n[ 192.936662] cxl_nvdimm_probe+0x119/0x1d0 [cxl_pmem]\n[ 192.940245] cxl_bus_probe+0x1a/0x60 [cxl_core]\n[ 192.943349] really_probe+0xde/0x380\n\nEste parche también se basa en el cambio anterior donde se llama a devm_cxl_add_nvdimm_bridge() desde drivers/cxl/pmem.c en lugar de drivers/cxl/core.c para asegurar la dependencia de cxl_acpi en cxl_pmem.\n\n1. Establecer probe_type de cxl_nvb a PROBE_FORCE_SYNCHRONOUS para asegurar que el controlador sea sondeado sincrónicamente cuando se llama a add_device().\n2. Añadir una comprobación en __devm_cxl_add_nvdimm_bridge() para asegurar que el controlador cxl_nvb esté adjunto durante cxl_acpi_probe().\n3. Tomar el bloqueo cxl_root uport_dev y el bloqueo cxl_nvb-&gt;dev en devm_cxl_add_nvdimm() antes de comprobar que nvdimm_bus es válido.\n4. Establecer el indicador cxl_nvdimm a CXL_NVD_F_INVALIDATED para que cxl_nvdimm_probe() salga con -EBUSY.\n\nLa eliminación de dispositivos cxl_nvdimm debería evitar que cualquier dispositivo huérfano se sondee una vez que el nvdimm_bus haya desaparecido.\n\n[ dj: Se corrigió el problema de kdoc reportado el día 0. ]\n[ dj: Corrige la fuga de referencia de cxl_nvb en caso de error. Gregory (kreview-0811365) ]"
    }
  ],
  "lastModified": "2026-06-17T10:21:24.253",
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