Issued:

2016-08-18

Updated:

2016-08-18

RHSA-2016:1633 - Important: kernel security and bug fix update

Synopsis

Important: kernel security and bug fix 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.

It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel's networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network. (CVE-2016-5696, Important)

Red Hat would like to thank Yue Cao from Cyber Security Group in the CS department of University of California, Riverside, for reporting this issue.

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

• kernel-tools-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-tools-libs-devel-3.10.0-327.28.3.el7.ppc64le.rpm
• perf-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
• perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-bootwrapper-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debug-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-3.10.0-327.28.3.el7.src.rpm
• python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-tools-libs-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-kdump-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
• kernel-devel-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debug-3.10.0-327.28.3.el7.s390x.rpm
• kernel-kdump-devel-3.10.0-327.28.3.el7.s390x.rpm
• kernel-tools-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-devel-3.10.0-327.28.3.el7.x86_64.rpm
• python-perf-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-tools-libs-devel-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-headers-3.10.0-327.28.3.el7.ppc64le.rpm
• perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
• perf-3.10.0-327.28.3.el7.s390x.rpm
• python-perf-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-devel-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-kdump-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debug-devel-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debug-devel-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-doc-3.10.0-327.28.3.el7.noarch.rpm
• kernel-debug-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
• python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debug-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
• kernel-headers-3.10.0-327.28.3.el7.x86_64.rpm
• python-perf-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debuginfo-common-s390x-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debug-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-tools-libs-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-tools-libs-devel-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-headers-3.10.0-327.28.3.el7.s390x.rpm
• kernel-debuginfo-common-ppc64le-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-bootwrapper-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
• perf-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
• kernel-headers-3.10.0-327.28.3.el7.ppc64.rpm
• perf-3.10.0-327.28.3.el7.ppc64.rpm
• python-perf-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-abi-whitelists-3.10.0-327.28.3.el7.noarch.rpm
• kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
• perf-3.10.0-327.28.3.el7.x86_64.rpm
• perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-3.10.0-327.28.3.el7.s390x.rpm
• kernel-3.10.0-327.28.3.el7.ppc64.rpm
• python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
• kernel-devel-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-debuginfo-common-ppc64-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-tools-libs-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debug-devel-3.10.0-327.28.3.el7.ppc64.rpm
• kernel-debug-devel-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
• kernel-tools-3.10.0-327.28.3.el7.ppc64le.rpm

Fixes

• This content is not included.BZ - 1354708

CVEs

• CVE-2016-5696

References

• http://www.redhat.com/security/updates/classification/#normal

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.