CVE-2013-4343: Use-after-free vulnerability in drivers/net/tun.c in the Linux kernel through 3.11.1 allows local users to...

Security readout for executives and security teams

CVE-2013-4343 is an old Linux kernel flaw in the TUN/TAP network driver. A local user or process with CAP_NET_ADMIN could trigger a use-after-free condition through a malformed TUNSETIFF request and potentially gain higher privileges. It matters most on unpatched legacy kernels or containers/services granted network administration capability. Exposure is most likely on Linux systems running kernel 3.11.1 or earlier, or distro backports retaining the vulnerable tun.c behavior. Risk depends on local access plus CAP_NET_ADMIN, including privileged containers or services granted that capability. Treat this as a legacy local privilege-escalation risk. It is not supported as actively exploited in the provided sources, but systems with old kernels or over-privileged containers should be remediated because kernel privilege bugs can undermine host isolation. Mitigation focus: Apply kernel updates from the relevant Linux distribution vendor advisory.; Prioritize systems granting CAP_NET_ADMIN to users, services, or containers.; Restrict unnecessary access to TUN/TAP functionality until patched..

Prepared

Jun 14, 2026, 15:32 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.