DEBIAN-CVE-2026-72442

In the Linux kernel, the following vulnerability has been resolved:  netfilter: flowtable: fix and simplify IP6IP6 tunnel handling  Fix nfflowip6tunnelproto() to use pskbmaypull() instead of skbheaderpointer() to ensure the outer IPv6 header is in the skb headroom, which is required for subsequent packet processing. Move ctx->offset update inside the IPPROTOIPV6 conditional block since it should only be adjusted when an IP6IP6 tunnel is actually detected. Simplify the rx path by removing ipv6skipexthdr() and checking ip6h->nexthdr directly, as the flowtable fast path only handles simple IP6IP6 encapsulation without extension headers. Drop the tunnel encapsulation limit destination option support from the tx path to match, since the rx path no longer handles extension headers. Remove the encaplimit parameter from nfflowoffloadipv6forward(), nfflowtunnelip6ip6push() and nfflowtunnelv6push(), along with the ipv6teltxoption struct and related headroom/MTU adjustments.