New lxc packages are available for Slackware 14.2 and -current to fix a security issue.

Here are the details from the Slackware 14.2 ChangeLog:
+--------------------------+
patches/packages/lxc-2.0.9_d3a03247-i586-1_slack14.2.txz: Upgraded.
This update fixes a security issue where a malicious privileged container
could overwrite the host binary and thus gain root-level code execution on
the host. As the LXC project considers privileged containers to be unsafe
no CVE has been assigned for this issue for LXC. To prevent this attack,
LXC has been patched to create a temporary copy of the calling binary
itself when it starts or attaches to containers. To do this LXC creates an
anonymous, in-memory file using the memfd_create() system call and copies
itself into the temporary in-memory file, which is then sealed to prevent
further modifications. LXC then executes this sealed, in-memory file
instead of the original on-disk binary.
For more information, see:
https://seclists.org/oss-sec/2019/q1/119
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project!

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/lxc-2.0.9_d3a03247-i586-1_slack14.2.txz

Updated package for Slackware x86_64 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/lxc-2.0.9_d3a03247-x86_64-1_slack14.2.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/ap/lxc-2.0.9_d3a03247-i586-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/ap/lxc-2.0.9_d3a03247-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 14.2 package:
d61ae78b948167877314791b0e7efb56 lxc-2.0.9_d3a03247-i586-1_slack14.2.txz

Slackware x86_64 14.2 package:
ee7f83208fd2677ebe57f02348dcc82d lxc-2.0.9_d3a03247-x86_64-1_slack14.2.txz

Slackware -current package:
d99534882f2ab6c021bde62603883ba9 ap/lxc-2.0.9_d3a03247-i586-1.txz

Slackware x86_64 -current package:
c623108d950f96465e8df0a3cb0cecf6 ap/lxc-2.0.9_d3a03247-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg lxc-2.0.9_d3a03247-i586-1_slack14.2.txz

  lxc (SSA:2019-043-01) Updates for Slackware