CVE-2026-53042 (GCVE-0-2026-53042)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-06-24 16:29
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.
References
Impacted products
Vendor Product Version
Linux Linux Version: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b
Version: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b
Version: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/fwctl/main.c"
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          "vendor": "Linux",
          "versions": [
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          "versions": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfwctl: Fix class init ordering to avoid NULL pointer dereference on device removal\n\nCXL is linked before fwctl in drivers/Makefile. Both use `module_init, so\n`cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls\n`fwctl_register()` and then `device_add()`, fwctl_class is not yet\nregistered because fwctl_init() hasn\u0027t run, causing `class_to_subsys()` to\nreturn NULL and skip knode_class initialization.\n\nOn device removal, `class_to_subsys()` returns non-NULL, and\n`device_del()` calls `klist_del()` on the uninitialized knode, triggering\na NULL pointer dereference."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:48.273Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f"
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          "url": "https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29"
        }
      ],
      "title": "fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53042",
    "datePublished": "2026-06-24T16:29:48.273Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-06-24T16:29:48.273Z",
    "state": "PUBLISHED"
  },
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}


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