UBUNTU-CVE-2026-64538

ipv6: Fix null-ptr-deref in fib6nhmtuchange...

CVE-2026-64538

CVE-2026-64538 concerns a Linux kernel vulnerability where fib6_nh_mtu_change() dereferences idev->cnf.mtu6 after re-fetching idev with __in6_dev_get(arg->dev) without a NULL check. This can occur because addrconf_ifdown() clears dev->ip6_ptr after tb6_lock is released, allowing an RA-dr...