Linux CVE-2025-38659

Apply the Linux kernel security patch immediately available from your distribution vendor. For Ubuntu systems, install the updates referenced in USN-8126-1 via standard package management (apt update && apt upgrade). For other distributions, consult your vendor's security advisory for the specific patched kernel version. Until patching is complete, mitigate risk by disabling GFS2 filesystem support if the system does not require cluster filesystem functionality (rebuild kernel with CONFIG_GFS2=n), or restrict GFS2 cluster membership to prevent single-node-only configurations that trigger the vulnerable code path. For production GFS2 clusters, ensure proper cluster quorum and fencing mechanisms are in place to prevent isolated nodes from attempting recovery. No workarounds exist for systems that actively use GFS2 in multi-node clusters.