arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtual guests.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd
lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html
www.securityfocus.com/bid/105120
www.securitytracker.com/id/1041601
access.redhat.com/errata/RHSA-2019:2029
access.redhat.com/errata/RHSA-2019:2043
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1
github.com/torvalds/linux/commit/5800dc5c19f34e6e03b5adab1282535cb102fafd
lists.debian.org/debian-lts-announce/2018/10/msg00003.html
twitter.com/grsecurity/status/1029324426142199808
usn.ubuntu.com/3775-1/
usn.ubuntu.com/3775-2/
usn.ubuntu.com/3776-1/
usn.ubuntu.com/3776-2/
usn.ubuntu.com/3777-1/
usn.ubuntu.com/3777-2/
usn.ubuntu.com/3777-3/
www.debian.org/security/2018/dsa-4308