Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 461
Alerts This Week
Warning Icon 1 461

Red Hat RHEL 7 RHSA-2017:0295-01 Important: Kernel-RT Escalation Risk

red hat
Calendar Grey February 22, 2017
Scroller Redhat
An essential security patch for kernel-rt within Red Hat tackling vulnerabilities related to privilege elevation and memory management issues.
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.
Security Fix(es):
* A use-after-free flaw was found in the way the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer) resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set on the socket. A local, unprivileged user could use this flaw to alter the kernel memory, allowing them to escalate their privileges on the system. (CVE-2017-6074, Important)

Topics%20covered

Topics Covered

security advisory bug fix Red Hat Enterprise Linux important escalation memory handling kernel-rt

References

https://access.redhat.com/security/cve/CVE-2017-6074 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-514.6.1.rt56.430.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-514.6.1.rt56.430.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debug-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-kvm-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-trace-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source: kernel-rt-3.10.0-514.6.1.rt56.430.el7.src.rpm
noarch:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2017:0295-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0295.html
Issue date: 2017-02-22

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.

Topics%20covered

Topics Covered

security advisory bug fix Red Hat Enterprise Linux important escalation memory handling kernel-rt

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

1423071 - CVE-2017-6074 kernel: use after free in dccp protocol

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.