CVE-2026-53042
N/A
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. Whencxl_pci_probe()callsfwctl_register()and thendevice_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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b < a28f56988c8e5bb9375806a5cfb0bf54d662ae3f | affected |
| Linux | Linux | 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b < 1075f2f590fdac147f8b8010c35b606564b5c7d7 | affected |
| Linux | Linux | 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b < a55f80233f384dc89ef3425b2e1dd0e6d44bcf29 | affected |
| Linux | Linux | 6.15 | affected |
| Linux | Linux | 0 < 6.15 | unaffected |
| Linux | Linux | 6.18.33 <= 6.18.* | unaffected |
| Linux | Linux | 7.0.10 <= 7.0.* | unaffected |
| Linux | Linux | 7.1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f
- https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7
- https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29
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