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 IPPROTO_IPV6 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 nfflowoffloadipv6_forward(),

nfflowtunnelip6ip6push() and nfflowtunnelv6push(), along with

the ipv6teltxoption struct and related headroom/MTU adjustments.