runc through 1.0.0-rc8, as used in Docker through 19.03.2-ce and other products, allows AppArmor restriction bypass because libcontainer/rootfs_linux.go incorrectly checks mount targets, and thus a malicious Docker image can mount over a /proc directory.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00073.html
lists.opensuse.org/opensuse-security-announce/2019-11/msg00009.html
lists.opensuse.org/opensuse-security-announce/2020-01/msg00010.html
access.redhat.com/errata/RHSA-2019:3940
access.redhat.com/errata/RHSA-2019:4074
access.redhat.com/errata/RHSA-2019:4269
github.com/opencontainers/runc/issues/2128
lists.debian.org/debian-lts-announce/2023/02/msg00016.html
lists.debian.org/debian-lts-announce/2023/03/msg00023.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62OQ2P7K5YDZ5BRCH2Q6DHUJIHQD3QCD/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DGK6IV5JGVDXHOXEKJOJWKOVNZLT6MYR/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPK4JWP32BUIVDJ3YODZSOEVEW6BHQCF/
security.gentoo.org/glsa/202003-21
security.netapp.com/advisory/ntap-20220221-0004/
usn.ubuntu.com/4297-1/