CVE-2026-74282

Status: UPDATED  |  Advisory ID: CVE-2026-74282

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

tipc: prevent snt_unacked underflow on CONN_ACK

tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count

from the unsigned 16-bit send counter snt_unacked without checking that it

does not exceed the number of messages actually outstanding:

tsk->snt_unacked -= msg_conn_ack(hdr);

msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK

message. If the ack count is larger than snt_unacked, the subtraction

wraps to a near-maximum value, leaving tsk_conn_cong() permanently true

and starving the connection of further transmits.

Validate the ACK count at the start of the CONN_ACK block and drop the

message if it acknowledges more messages than are outstanding. A peer (or,

for a local connection, the connected peer socket) can otherwise wedge a

TIPC connection's send side by sending an oversized connection ack. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References