RLSA-2026:49214 Important: kernel security update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: rtnetlink: add missing netlinknscapable check for peer netns CVE-2026-31692 kernel: netfilter: ctnetlink: ensure safe access to master conntrack CVE-2026-43116 kernel: fanotify: fix false...

kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns

A flaw was found in the Linux kernel's rtnetlink component. An unprivileged local user, leveraging a user namespace, can exploit a missing CAPNETADMIN capability check in the rtnlnewlink function. This allows the user to create paired network devices in arbitrary network namespaces, including the...

UBUNTU-CVE-2026-31692

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlinknscapable check for peer netns rtnlnewlink lacks a CAPNETADMIN capability check on the peer network namespace when creating paired devices veth, vxcan, netkit. This allows an unprivileged user with a...

CVE-2026-31692

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlinknscapable check for peer netns rtnlnewlink lacks a CAPNETADMIN capability check on the peer network namespace when creating paired devices veth, vxcan, netkit. This allows an unprivileged user with a...