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CVE-2019-19227

Description

In the AppleTalk subsystem in the Linux kernel before 5.1, there is a potential NULL pointer dereference because register_snap_client may return NULL. This will lead to denial of service in net/appletalk/aarp.c and net/appletalk/ddp.c, as demonstrated by unregister_snap_client, aka CID-9804501fa122.

POC

Reference

- http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9804501fa1228048857910a6bf23e085aade37cc

- https://usn.ubuntu.com/4254-2/

- https://usn.ubuntu.com/4287-2/

Github

- https://github.com/MrAgrippa/nes-01