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

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27
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-rc2 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/pmem.c",
            "drivers/cxl/cxl.h",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.14"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
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              "version": "7.0-rc2",
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      "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) ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:27:34.462Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b230daeee420833287cc77314439903e5312f10"
        },
        {
          "url": "https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e"
        }
      ],
      "title": "cxl: Fix race of nvdimm_bus object when creating nvdimm objects",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23348",
    "datePublished": "2026-03-25T10:27:34.462Z",
    "dateReserved": "2026-01-13T15:37:45.999Z",
    "dateUpdated": "2026-03-25T10:27:34.462Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23348\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:33.050\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"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) ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5b230daeee420833287cc77314439903e5312f10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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