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Red Hat Enterprise Linux 7 RHSA-2016:1632-01 Critical: Kernel-RT Data Leak
red hat
August 18, 2016
An update for kernel-rt is now available for Red Hat Enterprise Linux 7
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.
Summary
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
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.
References
https://access.redhat.com/security/cve/CVE-2016-5696 https://access.redhat.com/security/updates/classification/#important
Package List
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-327.28.3.rt56.235.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-327.28.3.rt56.235.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debug-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-devel-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-trace-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-327.28.3.rt56.235.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source:
kernel-rt-3.10.0-327.28.3.rt56.235.el7.src.rpm
noarch:
Read the Full Advisory
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Severity
important
Lowest
Low
Medium
High
Critical
Advisory ID: RHSA-2016:1632-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1632.html
Issue date: 2016-08-18
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Relevant Releases Architectures
Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64
Bugs Fixed
1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.
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