RedHat: RHSA-2018-2394:01 Important: kernel security update
Summary
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
Security Fix(es):
* Modern operating systems implement virtualization of physical memory to
efficiently use available system resources and provide inter-domain
protection through access control and isolation. The L1TF issue was found
in the way the x86 microprocessor designs have implemented speculative
execution of instructions (a commonly used performance optimisation) in
combination with handling of page-faults caused by terminated virtual to
physical address resolving process. As a result, an unprivileged attacker
could use this flaw to read privileged memory of the kernel or other
processes and/or cross guest/host boundaries to read host memory by
conducting targeted cache side-channel attacks. (CVE-2018-3620,
CVE-2018-3646)
* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of Load & Store instructions
(a commonly used performance optimization). It relies on the presence of a
precisely-defined instruction sequence in the privileged code as well as
the fact that memory read from address to which a recent memory write has
occurred may see an older value and subsequently cause an update into the
microprocessor's data cache even for speculatively executed instructions
that never actually commit (retire). As a result, an unprivileged attacker
could use this flaw to read privileged memory by conducting targeted cache
side-channel attacks. (CVE-2018-3639)
* kernel: kvm: vmx: host GDT limit corruption (CVE-2018-10901)
For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.
Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting
CVE-2018-3620 and CVE-2018-3646; Ken Johnson (Microsoft Security Response
Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639;
and Vegard Nossum (Oracle Corporation) for reporting CVE-2018-10901.
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-2018-3620 https://access.redhat.com/security/cve/CVE-2018-3639 https://access.redhat.com/security/cve/CVE-2018-3646 https://access.redhat.com/security/cve/CVE-2018-10901 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/L1TF https://access.redhat.com/security/vulnerabilities/ssbd
Package List
Red Hat Enterprise Linux Server AUS (v. 6.4):
Source:
kernel-2.6.32-358.91.4.el6.src.rpm
noarch:
kernel-doc-2.6.32-358.91.4.el6.noarch.rpm
kernel-firmware-2.6.32-358.91.4.el6.noarch.rpm
x86_64:
kernel-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debug-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debug-devel-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm
kernel-devel-2.6.32-358.91.4.el6.x86_64.rpm
kernel-headers-2.6.32-358.91.4.el6.x86_64.rpm
perf-2.6.32-358.91.4.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 6.4):
Source:
kernel-2.6.32-358.91.4.el6.src.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm
python-perf-2.6.32-358.91.4.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.91.4.el6.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 is now available for Red Hat Enterprise Linux 6.4Advanced Update Support.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
Red Hat Enterprise Linux Server AUS (v. 6.4) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64
Bugs Fixed
1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF)
1601849 - CVE-2018-10901 kernel: kvm: vmx: host GDT limit corruption
