CVE-2026-23348 (GCVE-0-2026-23348)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-04-13 06:05
VLAI?
Title
cxl: Fix race of nvdimm_bus object when creating nvdimm objects
Summary
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. [ 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 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. 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. 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) ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8fdcb1704f61a8fd9be0f3849a174d084def0666 , < 5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7 (git)
Affected: 8fdcb1704f61a8fd9be0f3849a174d084def0666 , < 5b230daeee420833287cc77314439903e5312f10 (git)
Affected: 8fdcb1704f61a8fd9be0f3849a174d084def0666 , < 96a1fd0d84b17360840f344826897fa71049870e (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "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-\u003eparent that points to \u0026nvdimm_bus-\u003edev.\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]  \u003cTASK\u003e\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-\u003edev 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) ]"
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      "providerMetadata": {
        "dateUpdated": "2026-04-13T06:05:32.167Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e"
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      "title": "cxl: Fix race of nvdimm_bus object when creating nvdimm objects",
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    "dateReserved": "2026-01-13T15:37:45.999Z",
    "dateUpdated": "2026-04-13T06:05:32.167Z",
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With the nvdimm_bus object missing,\\n__nd_device_register() will trigger NULL pointer dereference when\\naccessing the dev-\u003eparent that points to \u0026nvdimm_bus-\u003edev.\\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]  \u003cTASK\u003e\\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-\u003edev 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 condici\u00f3n de carrera del objeto nvdimm_bus al crear objetos nvdimm\\n\\nSe encontr\u00f3 el problema durante la ejecuci\u00f3n de la prueba unitaria cxl-translate.sh. A\u00f1adir un retardo de 3s justo antes de la prueba parece hacer que el problema se reproduzca de forma bastante consistente. El m\u00f3dulo cxl_translate tiene una dependencia de cxl_acpi y provoca que los objetos nvdimm hu\u00e9rfanos se vuelvan a sondear despu\u00e9s 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() activar\u00e1 una desreferencia de puntero NULL al acceder a dev-\u0026gt;parent que apunta a \u0026amp;nvdimm_bus-\u0026gt;dev.\\n\\n[ 192.884510] BUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 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 tambi\u00e9n 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 sincr\u00f3nicamente cuando se llama a add_device().\\n2. A\u00f1adir una comprobaci\u00f3n en __devm_cxl_add_nvdimm_bridge() para asegurar que el controlador cxl_nvb est\u00e9 adjunto durante cxl_acpi_probe().\\n3. Tomar el bloqueo cxl_root uport_dev y el bloqueo cxl_nvb-\u0026gt;dev en devm_cxl_add_nvdimm() antes de comprobar que nvdimm_bus es v\u00e1lido.\\n4. Establecer el indicador cxl_nvdimm a CXL_NVD_F_INVALIDATED para que cxl_nvdimm_probe() salga con -EBUSY.\\n\\nLa eliminaci\u00f3n de dispositivos cxl_nvdimm deber\u00eda evitar que cualquier dispositivo hu\u00e9rfano se sondee una vez que el nvdimm_bus haya desaparecido.\\n\\n[ dj: Se corrigi\u00f3 el problema de kdoc reportado el d\u00eda 0. ]\\n[ dj: Corrige la fuga de referencia de cxl_nvb en caso de error. Gregory (kreview-0811365) ]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14.1\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"1DE73683-A644-45C4-8FC6-3637F6AAE324\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"6A05198E-F8FA-4517-8D0E-8C95066AED38\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5b230daeee420833287cc77314439903e5312f10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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