fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53042
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:15 UTC
Updated2026-07-14 19:30:54 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001660000 probability, percentile 0.061420000 (date 2026-07-13)

Problem Types: CWE-824

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b a28f56988c8e5bb9375806a5cfb0bf54d662ae3f git Not specified
CNA Linux Linux affected 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b 1075f2f590fdac147f8b8010c35b606564b5c7d7 git Not specified
CNA Linux Linux affected 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b a55f80233f384dc89ef3425b2e1dd0e6d44bcf29 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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