Kernel security update: CVE-2017-18017 and other; new kernel 2.6.32-042stab128.2, Virtuozzo 6.0 Update 12 Hotfix 22 (6.0.12-3701)

This update provides a new Virtuozzo 6.0 kernel 2.6.32-042stab128.2 that introduces security and stability fixes and 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. In addition, the update features a non-kernel fix for VSTOR-7228.
Vulnerability id: CVE-2018-5332
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.

Vulnerability id: CVE-2018-5333
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.

Vulnerability id: CVE-2017-18017
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.