CVE-2026-53042 (GCVE-0-2026-53042)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < a28f56988c8e5bb9375806a5cfb0bf54d662ae3f (git)
Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < 1075f2f590fdac147f8b8010c35b606564b5c7d7 (git)
Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < a55f80233f384dc89ef3425b2e1dd0e6d44bcf29 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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        "dateUpdated": "2026-06-24T16:29:48.273Z",
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        "shortName": "Linux"
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    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-06-24T16:29:48.273Z",
    "state": "PUBLISHED"
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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.

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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.
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