kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

A flaw was found in the Linux kernel's Virtual Extensible LAN VXLAN module. This vulnerability occurs because a cached IP header pointer is improperly reused after a Path Maximum Transmission Unit PMTU check. When the packet's head is modified during the PMTU check, the old cached IP header point...

Linux Distros Unpatched Vulnerability : CVE-2026-63993

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - vxlan: do not reuse cached iphdr value after skbtunnelcheckpmtu skbtunnelcheckpmtu can change skb-head. Reusing oldiph afer skbtunnelcheckpmtu can cause an UAF...