Issued:: 2017-03-21
Updated:: 2017-03-21

RHSA-2017:0817 - Moderate: kernel security, bug fix, and enhancement update

Synopsis

Moderate: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory Moderate

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

It was discovered that a remote attacker could leverage the generation of IPv6 atomic fragments to trigger the use of fragmentation in an arbitrary IPv6 flow (in scenarios in which actual fragmentation of packets is not needed) and could subsequently perform any type of a fragmentation-based attack against legacy IPv6 nodes that do not implement RFC6946. (CVE-2016-10142, Moderate)
A flaw was discovered in the way the Linux kernel dealt with paging structures. When the kernel invalidated a paging structure that was not in use locally, it could, in principle, race against another CPU that is switching to a process that uses the paging structure in question. A local user could use a thread running with a stale cached virtual->physical translation to potentially escalate their privileges if the translation in question were writable and the physical page got reused for something critical (for example, a page table). (CVE-2016-2069, Moderate)
A race condition flaw was found in the ioctl_send_fib() function in the Linux kernel's aacraid implementation. A local attacker could use this flaw to cause a denial of service (out-of-bounds access or system crash) by changing a certain size value. (CVE-2016-6480, Moderate)
It was found that when the gcc stack protector was enabled, reading the /proc/keys file could cause a panic in the Linux kernel due to stack corruption. This happened because an incorrect buffer size was used to hold a 64-bit timeout value rendered as weeks. (CVE-2016-7042, Moderate)
It was found that when file permissions were modified via chmod and the user modifying them was not in the owning group or capable of CAP_FSETID, the setgid bit would be cleared. Setting a POSIX ACL via setxattr sets the file permissions as well as the new ACL, but doesn't clear the setgid bit in a similar way. This could allow a local user to gain group privileges via certain setgid applications. (CVE-2016-7097, Moderate)
A flaw was found in the Linux networking subsystem where a local attacker with CAP_NET_ADMIN capabilities could cause an out-of-bounds memory access by creating a smaller-than-expected ICMP header and sending to its destination via sendto(). (CVE-2016-8399, Moderate)
It was found that the blk_rq_map_user_iov() function in the Linux kernel's block device implementation did not properly restrict the type of iterator, which could allow a local attacker to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging write access to a /dev/sg device. (CVE-2016-9576, CVE-2016-10088, Moderate)
A flaw was found in the USB-MIDI Linux kernel driver: a double-free error could be triggered for the 'umidi' object. An attacker with physical access to the system could use this flaw to escalate their privileges. (CVE-2016-2384, Low)

The CVE-2016-7042 issue was discovered by Ondrej Kozina (Red Hat) and the CVE-2016-7097 issue was discovered by Andreas Gruenbacher (Red Hat) and Jan Kara (SUSE).

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

Product	Version	Arch
Red Hat Enterprise Linux for Scientific Computing	6	x86_64
Red Hat Enterprise Linux for Power, big endian	6	ppc64
Red Hat Enterprise Linux for IBM z Systems	6	s390x
Red Hat Enterprise Linux Workstation	6	x86_64
Red Hat Enterprise Linux Workstation	6	i386
Red Hat Enterprise Linux Server	6	x86_64
Red Hat Enterprise Linux Server	6	i386
Red Hat Enterprise Linux Server - Retired Extended Life Cycle Support	6	x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support	6	x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support	6	i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension	6	x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension	6	i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems)	6	s390x
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)	6	s390x
Red Hat Enterprise Linux Desktop	6	x86_64
Red Hat Enterprise Linux Desktop	6	i386

Updated Packages

python-perf-2.6.32-696.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debug-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.el6.i686.rpm
kernel-headers-2.6.32-696.el6.s390x.rpm
kernel-devel-2.6.32-696.el6.ppc64.rpm
kernel-kdump-devel-2.6.32-696.el6.s390x.rpm
kernel-debug-2.6.32-696.el6.s390x.rpm
python-perf-2.6.32-696.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.el6.s390x.rpm
python-perf-2.6.32-696.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-headers-2.6.32-696.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.el6.x86_64.rpm
python-perf-2.6.32-696.el6.i686.rpm
kernel-debug-devel-2.6.32-696.el6.i686.rpm
kernel-debug-2.6.32-696.el6.i686.rpm
kernel-debug-devel-2.6.32-696.el6.ppc64.rpm
perf-2.6.32-696.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debug-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-common-s390x-2.6.32-696.el6.s390x.rpm
kernel-kdump-2.6.32-696.el6.s390x.rpm
kernel-2.6.32-696.el6.i686.rpm
kernel-2.6.32-696.el6.x86_64.rpm
perf-2.6.32-696.el6.i686.rpm
perf-2.6.32-696.el6.ppc64.rpm
perf-2.6.32-696.el6.x86_64.rpm
kernel-headers-2.6.32-696.el6.ppc64.rpm
kernel-devel-2.6.32-696.el6.s390x.rpm
perf-debuginfo-2.6.32-696.el6.i686.rpm
kernel-bootwrapper-2.6.32-696.el6.ppc64.rpm
kernel-2.6.32-696.el6.s390x.rpm
kernel-debug-devel-2.6.32-696.el6.x86_64.rpm
kernel-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.el6.ppc64.rpm
kernel-abi-whitelists-2.6.32-696.el6.noarch.rpm
kernel-doc-2.6.32-696.el6.noarch.rpm
perf-debuginfo-2.6.32-696.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.el6.x86_64.rpm
kernel-devel-2.6.32-696.el6.i686.rpm
kernel-devel-2.6.32-696.el6.x86_64.rpm
kernel-firmware-2.6.32-696.el6.noarch.rpm
kernel-debug-devel-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-2.6.32-696.el6.src.rpm
perf-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-headers-2.6.32-696.el6.x86_64.rpm

Fixes

CVEs

References

Additional information

The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.