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

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:05
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
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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          "url": "https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23348\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:33.050\",\"lastModified\":\"2026-06-17T10:21:24.253\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"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-\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) ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/cxl/core/pmem.c\",\"drivers/cxl/cxl.h\",\"drivers/cxl/pmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8fdcb1704f61a8fd9be0f3849a174d084def0666\",\"lessThan\":\"5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdcb1704f61a8fd9be0f3849a174d084def0666\",\"lessThan\":\"5b230daeee420833287cc77314439903e5312f10\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdcb1704f61a8fd9be0f3849a174d084def0666\",\"lessThan\":\"96a1fd0d84b17360840f344826897fa71049870e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/cxl/core/pmem.c\",\"drivers/cxl/cxl.h\",\"drivers/cxl/pmem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.17\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.7\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:20:27+00:00",
      "cve": "CVE-2026-23348",
      "id": "CVE-2026-23348",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cxl: Fix race of nvdimm_bus object when creating nvdimm objects",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23348.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:37:01Z",
      "cve": "CVE-2026-23348",
      "id": "CVE-2026-23348",
      "initial_release_date": "2026-03-25T16:55:50Z",
      "product_status:known_affected": "237",
      "product_status:known_not_affected": "208",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23348",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23348.json",
      "version": "10"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.