CVE-2026-53042

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.

• CWE-824

• https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7Patch
• https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3fPatch
• https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29Patch

Published

Jun 24, 2026

Last Modified

Jul 14, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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