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...

PT-2026-64643

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcp reordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for ne...

UBUNTU-CVE-2021-46912

In the Linux kernel, the following vulnerability has been resolved: net: Make tcpallowedcongestioncontrol readonly in non-init netns Currently, tcpallowedcongestioncontrol is global and writable; writing to it in any net namespace will leak into all other net namespaces...