Important kernel security update: new kernel 2.6.18-028stab122.1 for Virtuozzo Containers for Linux 4.6

Issue date: 2017-03-15

Applies to: Virtuozzo Containers for Linux 4.6

Virtuozzo Advisory ID: VZA-2017-016

1. Overview

This update provides a new Virtuozzo Containers for Linux 4.6 kernel 2.6.18-028stab122.1 based on the Red Hat Enterprise Linux 5 kernel 2.6.18-419.el5. This update is a rebase to a new Red Hat Enterprise Linux kernel. It provides security fixes inherited from the RHEL kernel and no internal fixes.

IMPORTANT: The security vulnerabilities mentioned in this advisory only affect the host but not the containers on it because DCCP is disabled in containers.

2. Security Fixes

[Important] A use-after-free flaw was found in the way the Linux kernel’s Datagram Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer) resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set on the socket. A local, unprivileged user could use this flaw to alter the kernel memory, allowing them to escalate their privileges on the system. (CVE-2017-6074)
[Moderate] It was found that the Linux kernel’s Datagram Congestion Control Protocol (DCCP) implementation used the IPv4-only inet_sk_rebuild_header() function for both IPv4 and IPv6 DCCP connections, which could result in memory corruptions. A remote attacker could use this flaw to crash the system. (CVE-2017-2634)

3. Installing the Update

Install the update with the ‘vzup2date’ utility included in the Virtuozzo Containers for Linux 4.6 distribution.

4. References

The JSON file with the list of new and updated packages is available at JSON file.