The Linux kernel 4.15 has a Buffer Overflow via an SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ioctl write operation to /dev/snd/seq by a local user.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.debian.org/security/2018/dsa-4188
https://www.debian.org/security/2018/dsa-4187
https://usn.ubuntu.com/3798-2/
https://usn.ubuntu.com/3798-1/
https://usn.ubuntu.com/3631-2/
https://usn.ubuntu.com/3631-1/
https://lists.debian.org/debian-lts-announce/2018/05/msg00000.html
https://bugzilla.redhat.com/show_bug.cgi?id=1550142
https://access.redhat.com/errata/RHSA-2019:1487
https://access.redhat.com/errata/RHSA-2019:1483
https://access.redhat.com/errata/RHSA-2018:2948
https://access.redhat.com/errata/RHSA-2018:2395
https://access.redhat.com/errata/RHSA-2018:2390
https://access.redhat.com/errata/RHSA-2018:2384
http://www.securityfocus.com/bid/103605
http://mailman.alsa-project.org/pipermail/alsa-devel/2018-February/132026.html
http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00067.html