UBUNTU-CVE-2026-98382: High severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject dev-bound-only programs on other devices bpfoffloaddevmatch() falls back to comparing offdev pointers after an exact netdev mismatch. Bound-only programs normally have NULL offdevs, so unrelated netdevs compare equal. A bound-only program on an offload-registered netdev can instead inherit a real offdev and match a sibling port. With CAPBPF and CAPNETADMIN, a caller can use bpf(BPFLINKCREATE) with a different target ifindex to run metadata kfuncs specialized for the bound driver on the target driver's xdpbuff. Running a veth-bound program on tun reads beyond tun's bare stack xdpbuff as a vethxdpbuff. Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:vethxdprxtimestamp (drivers/net/veth.c:1673) Call Trace: ... tunbuildskb (drivers/net/tun.c:1739) tungetuser (drivers/net/tun.c:1856) tunchrwriteiter (drivers/net/tun.c:2091) vfswrite (fs/readwrite.c:595 fs/readwrite.c:687) ksyswrite (fs/readwrite.c:739) dosyscall64 (arch/x86/entry/syscall64.c:84) entrySYSCALL64afterhwframe (arch/x86/entry/entry64.S:121) Kernel panic - not syncing: Fatal exception in interrupt Restrict non-offloaded programs to exact netdev matches and retain the shared-offdev fallback only for genuinely offloaded multi-port programs.