This script is Copyright (C) 2017 Tenable Network Security, Inc.
The remote Red Hat host is missing one or more security updates.
An update for kernel is now available for Red Hat Enterprise Linux 6.2
Advanced Update Support.
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
The kernel packages contain the Linux kernel, the core of any Linux
Security Fix(es) :
* A flaw was found in the way memory was being allocated on the stack
for user space binaries. If heap (or different memory region) and
stack memory regions were adjacent to each other, an attacker could
use this flaw to jump over the stack guard gap, cause controlled
memory corruption on process stack or the adjacent memory region, and
thus increase their privileges on the system. This is a kernel-side
mitigation which increases the stack guard gap size from one page to 1
MiB to make successful exploitation of this issue more difficult.
Red Hat would like to thank Qualys Research Labs for reporting this
Bug Fix(es) :
* Previously, a kernel panic occurred when the mcelog daemon executed
a huge page memory offline. This update fixes the HugeTLB feature of
the Linux kernel to check for the Page Table Entry (PTE) NULL pointer
in the page_check_address () function. As a result, the kernel panic
no longer occurs under the described circumstances. (BZ#1444342)
* Previously, the kdump mechanism was trying to get the lock by the
vmalloc_sync_all() function during a kernel panic. Consequently, a
deadlock occurred, and the crashkernel did not boot. This update fixes
the vmalloc_sync_all() function to avoid synchronizing the vmalloc
area on the crashing CPU. As a result, the crashkernel parameter now
boots as expected, and the kernel dump is collected successfully under
the described circumstances. (BZ#1443494)
See also :
Update the affected packages.
Risk factor :
Medium / CVSS Base Score : 6.2
CVSS Temporal Score : 5.1
Public Exploit Available : true