CVE-2026-74281tipc: reject inverted service ranges from peer bindings

Official description

In the Linux kernel, the following vulnerability has been resolved: tipc: reject inverted service ranges from peer bindings tipc_update_nametbl() inserts a binding advertised by a peer node using the lower and upper service-range bounds taken directly from the wire, without checking that lower <= upper. The local bind path validates the ordering (tipc_uaddr_valid()), but the name-distribution path does not. A binding with lower > upper is inserted at the far end of the service-range rbtree (keyed on lower) where no lookup or withdrawal can ever match it (service_range_foreach_match() requires sr->lower <= end). The publication, its service_range node and the augmented rbtree entry are then leaked for the lifetime of the namespace, and there is no per-peer cap equivalent to TIPC_MAX_PUBL on locally created bindings. Reject inverted ranges in the network path as well. A peer node can otherwise leak unbounded binding-table memory by sending PUBLICATION items with lower > upper.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/cd1955f81bd8ebeef51b324989ac871ad1947fb6
• https://git.kernel.org/stable/c/f683200b83a0085d4e11abea8c1fdd9fdfb95b0b
• https://git.kernel.org/stable/c/f1715d92ee3095d9215b493a8603a81f646fcf61
• https://git.kernel.org/stable/c/581ef56e5c34d475056ce086dc2ba0e872ba6857
• https://git.kernel.org/stable/c/7e401233f9bb74a626e70698d0d62f3a94ac0676
• https://git.kernel.org/stable/c/973bf0ed896b9898668dbadb82ed849d7d573010
• https://git.kernel.org/stable/c/2afb648f7b99216c687db1f89739c995e1144153