Upstream is dead and the last release was on Apr 16, 2018. Some security vulnerabilities are described here: https://www.twistlock.com/labs-blog/breaking-out-of-coresos-rkt-3-new-cves/
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=18ff6ea2eceb75c442ba2746f9896b3877da124f commit 18ff6ea2eceb75c442ba2746f9896b3877da124f Author: Zac Medico <zmedico@gentoo.org> AuthorDate: 2019-05-31 22:59:49 +0000 Commit: Zac Medico <zmedico@gentoo.org> CommitDate: 2019-05-31 23:02:15 +0000 app-emulation/rkt: mask for removal in 30 days (bug 687100) Upstream is dead and there are multiple security vulnerabilities. Bug: https://bugs.gentoo.org/687100 Signed-off-by: Zac Medico <zmedico@gentoo.org> profiles/package.mask | 5 +++++ 1 file changed, 5 insertions(+)
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e02d314aa557b213fb38aa3eeea910c45a81dcaa commit e02d314aa557b213fb38aa3eeea910c45a81dcaa Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2019-08-31 07:47:40 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2019-08-31 07:47:54 +0000 app-emulation/rkt: Remove last-rited pkg Closes: https://bugs.gentoo.org/687100 Signed-off-by: Michał Górny <mgorny@gentoo.org> app-emulation/rkt/Manifest | 9 - app-emulation/rkt/metadata.xml | 32 ---- app-emulation/rkt/rkt-1.29.0.ebuild | 267 ----------------------------- app-emulation/rkt/rkt-1.30.0.ebuild | 254 --------------------------- profiles/features/selinux/package.use.mask | 4 - profiles/package.mask | 5 - 6 files changed, 571 deletions(-)