Issued:
2018-08-14
Updated:
2018-08-14

RHSA-2018:2394 - Security Advisory

Synopsis

Important: kernel security update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support.

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.

Description

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.

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.

Affected Products

  • Red Hat Enterprise Linux Server - AUS 6.4 x86_64

Fixes

  • BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
  • BZ - 1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF)
  • BZ - 1601849 - CVE-2018-10901 kernel: kvm: vmx: host GDT limit corruption

CVEs

References

Red Hat Enterprise Linux Server - AUS 6.4

SRPM
kernel-2.6.32-358.91.4.el6.src.rpm SHA-256: f6985ef824f459e228b6e5d7483dd324a8a6484c54357f2b7e04ff8288c22c0f
x86_64
kernel-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: f6fcd0102c5e11faf736ac035fc039f39b18f7b562cca8e1b643d8a5f083d602
kernel-debug-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 9057cfd9e2829ed764e3f5f3c4802ecbf07f8df871296270a7fcc61142ecb922
kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: bc0210d0dc9203c827d256903cb70c7c1fde6999ce822762d26f5489076ca410
kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: bc0210d0dc9203c827d256903cb70c7c1fde6999ce822762d26f5489076ca410
kernel-debug-devel-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: d4dea8655e53d347c5c475f7b894b133bad98d757986014c5bf335f710433282
kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 29ca944e0424710715fc8d31079e4fe3bba52d949b3b7208861a3291555a4538
kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 29ca944e0424710715fc8d31079e4fe3bba52d949b3b7208861a3291555a4538
kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 3e4d6d44ed53487dc63622c00b6f32466b7c09de69a98b199f3205c9be861f46
kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 3e4d6d44ed53487dc63622c00b6f32466b7c09de69a98b199f3205c9be861f46
kernel-devel-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 99edf574ec316af0eefd3496277bd6b34c00fe35402442e312fe4188c08bf126
kernel-doc-2.6.32-358.91.4.el6.noarch.rpm SHA-256: 7d25914819ab8ab8e14ad4436b44cb13ca6cfc857ee7a1d82316aca19a567218
kernel-firmware-2.6.32-358.91.4.el6.noarch.rpm SHA-256: c2b6d8d065d8a2cb27f4ba22cfdbebe7618ada3ccb6aca59055d2bd466326e0e
kernel-headers-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: aebcc044a23299eed8cb18a3141178266919ee6c4851b53886600d5e47bcbb57
perf-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: fbac494ea5c03bcffb383564bd76ccb8a1b1d7d399fcd0abe7f83a4af52c4fc7
perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 129e4ff7763571e28994e5ff65e23b769365686ded36a9b87dec4edc03d40c0a
perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: 129e4ff7763571e28994e5ff65e23b769365686ded36a9b87dec4edc03d40c0a
python-perf-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: d67b9da5513a750e7932cf70008cc422201b0faad3492a5d942e3bb55910b0d9
python-perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: b60a3f7c681c2dae8a674320ed66688a82c34bf558f6c54cbd7578718f6ae9b7
python-perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm SHA-256: b60a3f7c681c2dae8a674320ed66688a82c34bf558f6c54cbd7578718f6ae9b7

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