RedHat: RHSA-2016-1631:01 Important: realtime-kernel security and bug fix
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.
Summary
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.
References
https://access.redhat.com/security/cve/CVE-2016-5696 https://access.redhat.com/security/updates/classification/#important
Package List
MRG Realtime for RHEL 6 Server v.2:
Source:
kernel-rt-3.10.0-327.rt56.195.el6rt.src.rpm
noarch:
kernel-rt-doc-3.10.0-327.rt56.195.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-327.rt56.195.el6rt.noarch.rpm
x86_64:
kernel-rt-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-327.rt56.195.el6rt.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/
Topic
An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.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.
Topic
Relevant Releases Architectures
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
Bugs Fixed
1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.