CVE-2026-31638

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged. A flaw was found in the Linux kernel’s rxrpc subsystem. This vulnerability occurs when the system processes a packet intended for a client after the client’s call on the channel has already been terminated. An attacker could exploit this protocol error path, which improperly handles call references, to trigger a kernel crash, leading to a Denial of Service (DoS).

Live-patch status from KernelCare for each operating system.