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Red Hat Security Advisory

Synopsis: Moderate: kernel security, bug fix, and enhancement update
Advisory ID: RHSA-2017:0817-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0817.html
Issue date: 2017-03-21
CVE Names: CVE-2016-10088 CVE-2016-10142 CVE-2016-2069
CVE-2016-2384 CVE-2016-6480 CVE-2016-7042
CVE-2016-7097 CVE-2016-8399 CVE-2016-9576
=====================================================================

1. Summary:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) – i386, noarch, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) – i386, x86_64

3. 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.

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

847106 – ext2 tests hang while running fsfuzzer
1301893 – CVE-2016-2069 kernel: race condition in the TLB flush logic
1308444 – CVE-2016-2384 kernel: double-free in usb-audio triggered by invalid USB descriptor
1325766 – RHEL6.7: NFSv3 client performance regression where ls -l takes too long with “aggressive readdirplus” commit
1362466 – CVE-2016-6480 kernel: scsi: aacraid: double fetch in ioctl_send_fib()
1368938 – CVE-2016-7097 kernel: Setting a POSIX ACL via setxattr doesn’t clear the setgid bit
1373966 – CVE-2016-7042 kernel: Stack corruption while reading /proc/keys when gcc stack protector is enabled
1403145 – CVE-2016-9576 kernel: Use after free in SCSI generic device interface
1403833 – CVE-2016-8399 kernel: net: Out of bounds stack read in memcpy_fromiovec
1412210 – CVE-2016-10088 kernel: Use after free in SCSI generic device interface (CVE-2016-9576 regression)
1415908 – CVE-2016-10142 kernel – IPV6 fragmentation flaw

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-696.el6.src.rpm

i386:
kernel-2.6.32-696.el6.i686.rpm
kernel-debug-2.6.32-696.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debug-devel-2.6.32-696.el6.i686.rpm
kernel-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.el6.i686.rpm
kernel-devel-2.6.32-696.el6.i686.rpm
kernel-headers-2.6.32-696.el6.i686.rpm
perf-2.6.32-696.el6.i686.rpm
perf-debuginfo-2.6.32-696.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.el6.noarch.rpm
kernel-doc-2.6.32-696.el6.noarch.rpm
kernel-firmware-2.6.32-696.el6.noarch.rpm

x86_64:
kernel-2.6.32-696.el6.x86_64.rpm
kernel-debug-2.6.32-696.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.el6.i686.rpm
kernel-debug-devel-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.el6.x86_64.rpm
kernel-devel-2.6.32-696.el6.x86_64.rpm
kernel-headers-2.6.32-696.el6.x86_64.rpm
perf-2.6.32-696.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.el6.i686.rpm
perf-debuginfo-2.6.32-696.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debuginfo-2.6.32-696.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.el6.i686.rpm
perf-debuginfo-2.6.32-696.el6.i686.rpm
python-perf-2.6.32-696.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.el6.x86_64.rpm
python-perf-2.6.32-696.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
kernel-2.6.32-696.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.el6.noarch.rpm
kernel-doc-2.6.32-696.el6.noarch.rpm
kernel-firmware-2.6.32-696.el6.noarch.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-696.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.el6.noarch.rpm
kernel-doc-2.6.32-696.el6.noarch.rpm
kernel-firmware-2.6.32-696.el6.noarch.rpm

ppc64:
kernel-2.6.32-696.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-696.el6.ppc64.rpm
kernel-debug-2.6.32-696.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-debug-devel-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.el6.ppc64.rpm
kernel-devel-2.6.32-696.el6.ppc64.rpm
kernel-headers-2.6.32-696.el6.ppc64.rpm
perf-2.6.32-696.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.el6.ppc64.rpm

s390x:
kernel-2.6.32-696.el6.s390x.rpm
kernel-debug-2.6.32-696.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debug-devel-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.el6.s390x.rpm
kernel-devel-2.6.32-696.el6.s390x.rpm
kernel-headers-2.6.32-696.el6.s390x.rpm
kernel-kdump-2.6.32-696.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-kdump-devel-2.6.32-696.el6.s390x.rpm
perf-2.6.32-696.el6.s390x.rpm
perf-debuginfo-2.6.32-696.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

ppc64:
kernel-debug-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.el6.ppc64.rpm
python-perf-2.6.32-696.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.el6.s390x.rpm
perf-debuginfo-2.6.32-696.el6.s390x.rpm
python-perf-2.6.32-696.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-696.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.el6.noarch.rpm
kernel-doc-2.6.32-696.el6.noarch.rpm
kernel-firmware-2.6.32-696.el6.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-10088
https://access.redhat.com/security/cve/CVE-2016-10142
https://access.redhat.com/security/cve/CVE-2016-2069
https://access.redhat.com/security/cve/CVE-2016-2384
https://access.redhat.com/security/cve/CVE-2016-6480
https://access.redhat.com/security/cve/CVE-2016-7042
https://access.redhat.com/security/cve/CVE-2016-7097
https://access.redhat.com/security/cve/CVE-2016-8399
https://access.redhat.com/security/cve/CVE-2016-9576
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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