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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-7.0.0-1008-gcpUpgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-26.04Upgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-gcp-64kUpgrade linux-image-azure-fde-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-azureUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-generic-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-nvidiaUpgrade linux-image-oem-24.04cUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-gke-64kUpgrade linux-image-azure-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-ibmUpgrade linux-image-raspiUpgrade linux-image-7.0.0-1009-oemUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-realtime-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-gcpUpgrade linux-image-genericUpgrade linux-image-7.0.0-1008-gcp-64kUpgrade linux-image-oracle-64kUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1010-azureUpgrade linux-image-oem-24.04bUpgrade linux-image-7.0.0-28-realtime-64kUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-28-realtimeUpgrade linux-image-oracleUpgrade linux-image-generic-7.0Upgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-aws-64kUpgrade linux-image-awsUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-raspi-7.0Upgrade linux-image-gkeUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-oem-24.04aUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-oem-24.04dUpgrade linux-image-7.0.0-1003-gkeUpgrade linux-image-realtimeUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1003-gke-64kUpgrade linux-image-virtual | Jun 28, 2026 | Jun 24, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub