Kernel security update: CVE-2017-18017 and other; new kernel 2.6.32-042stab128.2 for Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0

Issue date: 2018-03-26

Applies to: Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0

Virtuozzo Advisory ID: VZA-2018-016

1. Overview

This update provides a new Virtuozzo Containers for Linux 4.7 and Server Bare Metal 5.0 kernel 2.6.32-042stab128.2 that is a rebase to the Red Hat Enterprise Linux 6.9 kernel 2.6.32-696.23.1.el6. This kernel was recompiled by the updated gcc with retpolines support. Retpolines are a technique used by the kernel to reduce overhead of mitigating Spectre Variant 2 attacks described in CVE-2017-5715. The kernel also introduces security and stability fixes.

2. Security Fixes

  • [Moderate] In the Linux kernel through 4.14.13, the rds_message_alloc_sgs() function does not validate a value that is used during DMA page allocation, leading to a heap-based out-of-bounds write (related to the rds_rdma_extra_size() function in ‘net/rds/rdma.c’) and thus to a system panic. (CVE-2018-5332)

  • [Moderate] The rds_cmsg_atomic() function in ‘net/rds/rdma.c’ mishandles cases where page pinning fails or an invalid address is supplied by a user. This can lead to a NULL pointer dereference in rds_atomic_free_op() and thus to a system panic. (CVE-2018-5333)

  • [Moderate] The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action. (CVE-2017-18017)

3. Bug Fixes

  • Fixed compilation warning in ip_map_cached_get(). (PSBM-80063)

  • nfs server kernel thread running on host was crashed in vzquota_dparent_check_same(). (PSBM-80879)

  • Minor ploop improvements. (PSBM-81964)

4. Installing the Update

Install the update with the ‘vzup2date’ utility included in the distribution.