Red Hat Security Advisory 2016-1633-01 - 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.
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Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2016:1633-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1633.html
Issue date: 2016-08-18
CVE Names: CVE-2016-5696
=====================================================================
1. Summary:
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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
3. 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.
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/):
1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.
6. Package List:
Red Hat Enterprise Linux Client (v. 7):
Source:
kernel-3.10.0-327.28.3.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-327.28.3.el7.noarch.rpm
kernel-doc-3.10.0-327.28.3.el7.noarch.rpm
x86_64:
kernel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-headers-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.x86_64.rpm
perf-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source:
kernel-3.10.0-327.28.3.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-327.28.3.el7.noarch.rpm
kernel-doc-3.10.0-327.28.3.el7.noarch.rpm
x86_64:
kernel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-headers-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.x86_64.rpm
perf-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source:
kernel-3.10.0-327.28.3.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-327.28.3.el7.noarch.rpm
kernel-doc-3.10.0-327.28.3.el7.noarch.rpm
ppc64:
kernel-3.10.0-327.28.3.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debug-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.28.3.el7.ppc64.rpm
kernel-devel-3.10.0-327.28.3.el7.ppc64.rpm
kernel-headers-3.10.0-327.28.3.el7.ppc64.rpm
kernel-tools-3.10.0-327.28.3.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.ppc64.rpm
perf-3.10.0-327.28.3.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
python-perf-3.10.0-327.28.3.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
ppc64le:
kernel-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debug-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-devel-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-headers-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-tools-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.ppc64le.rpm
perf-3.10.0-327.28.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
python-perf-3.10.0-327.28.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
s390x:
kernel-3.10.0-327.28.3.el7.s390x.rpm
kernel-debug-3.10.0-327.28.3.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.s390x.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-327.28.3.el7.s390x.rpm
kernel-devel-3.10.0-327.28.3.el7.s390x.rpm
kernel-headers-3.10.0-327.28.3.el7.s390x.rpm
kernel-kdump-3.10.0-327.28.3.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
kernel-kdump-devel-3.10.0-327.28.3.el7.s390x.rpm
perf-3.10.0-327.28.3.el7.s390x.rpm
perf-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
python-perf-3.10.0-327.28.3.el7.s390x.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.s390x.rpm
x86_64:
kernel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-headers-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.x86_64.rpm
perf-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.28.3.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64.rpm
ppc64le:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.ppc64le.rpm
x86_64:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
kernel-3.10.0-327.28.3.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-327.28.3.el7.noarch.rpm
kernel-doc-3.10.0-327.28.3.el7.noarch.rpm
x86_64:
kernel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-devel-3.10.0-327.28.3.el7.x86_64.rpm
kernel-headers-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.28.3.el7.x86_64.rpm
perf-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 7):
x86_64:
kernel-debug-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.28.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.28.3.el7.x86_64.rpm
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-2016-5696
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2016 Red Hat, Inc.
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