CVE-2026-74401

Description

In the Linux kernel, the following vulnerability has been resolved: dlm: fix add msg handle in send_queue ordered In a benchmark scenario triggering a lot of requests that triggers a lot of DLM messages on the network it can be that the mh->seq is not ordered according the oldest seq number. This ordering is required by dlm_receive_ack as -before(mh->seq, seq)- will stop to check for older sequence numbers that are ordered in the tail of -node->send_queue-. The side effects of not having it correct ordered regarding -before(mh->seq, seq)- are refcounting issues and use-after free. I only was able to reproduce this issue in a experimental DLM branch and a user space DLM benchmark that uses io_uring. After changing this I don-t experienced any refcounting with the sending buffer issues anymore.