CVE-2026-89563

A flaw was found in the ip6tunnel module of the Linux kernel. Incorrect handling of socket buffers skb during headroom reallocation in the ip6tnlxmit function can lead to a double-free vulnerability. This occurs when an error path is taken after the original skb has been consumed, but the caller...

Linux net/ipv6/ip6_tunnel.c Heap Buffer Overflow DoS

The vulnerability of the ip4ip6err function in the net/ipv6/ip6tunnel.c module of the Linux kernel is related to buffer out-of-buffer writing. Exploiting this vulnerability could allow a remote attacker to execute arbitrary code...