CVE-2026-31662

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG

The GRP_ACK_MSG handler in tipc_group_proto_rcv() currently decrements

bc_ackers on every inbound group ACK, even when the same member has

already acknowledged the current broadcast round.

Because bc_ackers is a u16, a duplicate ACK received after the last

legitimate ACK wraps the counter to 65535. Once wrapped,

tipc_group_bc_cong() keeps reporting congestion and later group

broadcasts on the affected socket stay blocked until the group is

recreated.

Fix this by ignoring duplicate or stale ACKs before touching bc_acked or

bc_ackers. This makes repeated GRP_ACK_MSG handling idempotent and

prevents the underflow path.