kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()

A race condition flaw was found in the NHLDC Linux kernel driver when accessing nhdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system...

Linux kernel local privilege escalation flaw in n_hdlc（CVE-2017-2636）

This article discloses the exploitation of CVE-2017-2636, which is a race condition in the nhdlc Linux kernel driver drivers/tty/nhdlc.c. The described exploit gains root privileges bypassing Supervisor Mode Execution Protection SMEP. This driver provides HDLC serial line discipline and comes as ...