Issued:

2017-05-25

Updated:

2017-05-25

RHSA-2017:1308 - Important: kernel security, bug fix, and enhancement update

Synopsis

Important: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.

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.

Description

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

Security Fix(es):

• It was found that the packet_set_ring() function of the Linux kernel's networking implementation did not properly validate certain block-size data. A local attacker with CAP_NET_RAW capability could use this flaw to trigger a buffer overflow, resulting in the crash of the system. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2017-7308, Important)

• Mounting a crafted EXT4 image read-only leads to an attacker controlled memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)

• A flaw was found in the Linux kernel's implementation of seq_file where a local attacker could manipulate memory in the put() function pointer. This could lead to memory corruption and possible privileged escalation. (CVE-2016-7910, Moderate)

• A vulnerability was found in the Linux kernel. An unprivileged local user could trigger oops in shash_async_export() by attempting to force the in-kernel hashing algorithms into decrypting an empty data set. (CVE-2016-8646, Moderate)

• It was reported that with Linux kernel, earlier than version v4.10-rc8, an application may trigger a BUG_ON in sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is waiting on it to queue more data, and meanwhile another thread peels off the association being used by the first thread. (CVE-2017-5986, Moderate)

Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for reporting CVE-2016-8646.

Additional Changes:

This update also fixes several bugs and adds various enhancements. Documentation for these changes is available from the Technical Notes document linked to in 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

Updated Packages

• python-perf-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-tools-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-tools-libs-3.10.0-514.21.1.el7.ppc64.rpm
• perf-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-tools-libs-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-headers-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-debug-devel-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-tools-libs-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-bootwrapper-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debug-debuginfo-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-kdump-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debuginfo-common-ppc64le-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debug-debuginfo-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-tools-debuginfo-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debug-devel-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debug-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-debug-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debug-devel-3.10.0-514.21.1.el7.x86_64.rpm
• python-perf-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-debug-devel-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-headers-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-headers-3.10.0-514.21.1.el7.s390x.rpm
• kernel-kdump-devel-3.10.0-514.21.1.el7.s390x.rpm
• perf-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-devel-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-bootwrapper-3.10.0-514.21.1.el7.ppc64le.rpm
• perf-3.10.0-514.21.1.el7.ppc64le.rpm
• python-perf-debuginfo-3.10.0-514.21.1.el7.s390x.rpm
• kernel-tools-3.10.0-514.21.1.el7.ppc64le.rpm
• python-perf-debuginfo-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-tools-debuginfo-3.10.0-514.21.1.el7.ppc64le.rpm
• perf-debuginfo-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-abi-whitelists-3.10.0-514.21.1.el7.noarch.rpm
• kernel-tools-debuginfo-3.10.0-514.21.1.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debuginfo-common-s390x-3.10.0-514.21.1.el7.s390x.rpm
• kernel-3.10.0-514.21.1.el7.src.rpm
• kernel-debuginfo-3.10.0-514.21.1.el7.ppc64.rpm
• python-perf-3.10.0-514.21.1.el7.ppc64.rpm
• perf-debuginfo-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-debug-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-tools-libs-devel-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debuginfo-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debug-debuginfo-3.10.0-514.21.1.el7.ppc64le.rpm
• perf-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debug-debuginfo-3.10.0-514.21.1.el7.s390x.rpm
• kernel-devel-3.10.0-514.21.1.el7.ppc64.rpm
• perf-debuginfo-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debuginfo-common-ppc64-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debuginfo-common-x86_64-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-debuginfo-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-devel-3.10.0-514.21.1.el7.s390x.rpm
• kernel-debuginfo-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-tools-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-kdump-debuginfo-3.10.0-514.21.1.el7.s390x.rpm
• perf-debuginfo-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-doc-3.10.0-514.21.1.el7.noarch.rpm
• kernel-headers-3.10.0-514.21.1.el7.ppc64.rpm
• kernel-debug-3.10.0-514.21.1.el7.ppc64le.rpm
• kernel-tools-libs-devel-3.10.0-514.21.1.el7.ppc64.rpm
• python-perf-3.10.0-514.21.1.el7.s390x.rpm
• kernel-tools-libs-devel-3.10.0-514.21.1.el7.ppc64le.rpm
• python-perf-debuginfo-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-3.10.0-514.21.1.el7.x86_64.rpm
• kernel-devel-3.10.0-514.21.1.el7.x86_64.rpm

Fixes

• This content is not included.BZ - 1388821
• This content is not included.BZ - 1395190
• This content is not included.BZ - 1399727
• This content is not included.BZ - 1420276
• This content is not included.BZ - 1437404

CVEs

• CVE-2016-10208
• CVE-2016-7910
• CVE-2016-8646
• CVE-2017-5986
• CVE-2017-7308

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/articles/3034221

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.