[ Ubuntu: 4.15.0-256.267 ] * CVE-2026-46333 - ptrace: require CAPSYSPTRACE when task has no mm {CVE-2026-46333} * CVE-2026-46300 - net: skbuff: propagate shared-frag marker through copy/coalesce/gro/shift paths {CVE-2026-46300} * CVE-2026-43284 - xfrm: esp: avoid in-place decrypt on shared skb frags {CVE-2026-43284} * Packaging - Adopt +tuxcare.elsN versioning scheme * Bump ABI 4.15.0-257