5.5

CVE-2026-53042

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.15 < 6.18.33
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.10
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.022
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-824 Access of Uninitialized Pointer

The product accesses or uses a pointer that has not been initialized.

https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f
Patch
https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7
Patch
https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29
Patch