CVE-2026-31421

A flaw was found in the Linux kernel's clsfw network scheduler component. This vulnerability, a null pointer dereference, occurs when an empty clsfw filter is attached to a shared block and a specially crafted network packet with a specific mark is processed. An attacker with network access could...

Troubleshooting thin provisioning for shared block storage on XenServer

XenServer and Citrix Hypervisor use GFS2 to provide the ability to set up thin provisioning with a shared block storage device. Pools that use GFS2 to thin provision their shared block storage are clustered and behave differently to pools that use shared file-based storage or LVM with shared bloc...