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Red Hat Product Errata RHSA-2018:0017 - Security Advisory
Issued:
2018-01-04
Updated:
2018-01-04

RHSA-2018:0017 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: kernel security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended 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):

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited.

Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Please refer to References section for further information about this issue and the performance impact.

In this update mitigations for x86-64 architecture are provided.

Variant CVE-2017-5753 triggers the speculative execution by performing a bounds-check bypass. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall boundary and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5753, Important)

Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5715, Important)

Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors, during speculative execution of instruction permission faults, exception generation triggered by a faulting access is suppressed until the retirement of the whole instruction block. In a combination with the fact that memory accesses may populate the cache even when the block is being dropped and never committed (executed), an unprivileged local attacker could use this flaw to read privileged (kernel space) memory by conducting targeted cache side-channel attacks. (CVE-2017-5754, Important)

Note: CVE-2017-5754 affects Intel x86-64 microprocessors. AMD x86-64 microprocessors are not affected by this issue.

Red Hat would like to thank Google Project Zero for reporting these issues.

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 6.6 x86_64
  • Red Hat Enterprise Linux Server - TUS 6.6 x86_64

Fixes

  • BZ - 1519778 - CVE-2017-5753 hw: cpu: speculative execution bounds-check bypass
  • BZ - 1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection
  • BZ - 1519781 - CVE-2017-5754 hw: cpu: speculative execution permission faults handling

CVEs

  • CVE-2017-5715
  • CVE-2017-5753
  • CVE-2017-5754

References

  • https://access.redhat.com/security/updates/classification/#important
  • https://access.redhat.com/security/vulnerabilities/speculativeexecution
  • https://access.redhat.com/security/cve/CVE-2017-5753
  • https://access.redhat.com/security/cve/CVE-2017-5715
  • https://access.redhat.com/security/cve/CVE-2017-5754
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server - AUS 6.6

SRPM
kernel-2.6.32-504.64.4.el6.src.rpm SHA-256: 235d123905b461b39610fa08f97926ef153e8081bb0f877cba60baf6183ef118
x86_64
kernel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8a861ddecf0052b708032fecdbcc0d649f48dbafec1b6914ad343072f768d907
kernel-abi-whitelists-2.6.32-504.64.4.el6.noarch.rpm SHA-256: 3e22e8747355a832e3d95f1e6d83e091dce2fb4c59750ffe24d319450449d874
kernel-debug-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 94c1fb44b2944b0f229ef31442ced5f25215783c8617455b0fbd9ca7345b854f
kernel-debug-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 3adabe76c554fba3238814aec855f4a3646aea8b68efc8fae5024e765a0c54b4
kernel-debug-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 3adabe76c554fba3238814aec855f4a3646aea8b68efc8fae5024e765a0c54b4
kernel-debug-devel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: ebb85ce18acc4ce9e283f60afab2b98a4ff781983f90cde9cfd4c26e185b7188
kernel-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 503cf47cc3ccc9a6aaa3cdb26eded57873106b37928cea2f18e628a3b5f9fe15
kernel-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 503cf47cc3ccc9a6aaa3cdb26eded57873106b37928cea2f18e628a3b5f9fe15
kernel-debuginfo-common-x86_64-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: aa48352dc9cb0a1f6b532774a1a2fa815e3838f20aad5c47bc86bfb927c0d004
kernel-debuginfo-common-x86_64-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: aa48352dc9cb0a1f6b532774a1a2fa815e3838f20aad5c47bc86bfb927c0d004
kernel-devel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: eb3604d4df79dffa6fb14a29a3d8d7cd21ad21a6ca6eed9e695184d2cbf27b18
kernel-doc-2.6.32-504.64.4.el6.noarch.rpm SHA-256: b9339b94f9753eb0e846d32007f32a86fe1f5f1ead1fbe197957f19f76edfcda
kernel-firmware-2.6.32-504.64.4.el6.noarch.rpm SHA-256: 2c994e164c7891ac8ab5b94940fdda3c1e47a4b7bc82b3ca1935140653abb121
kernel-headers-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: fcea6c2f95a207c2b884216d998326cbd2090c2f73a7f4ef761b00428be72f84
perf-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: d6b835da2cea19d2972b361c6f4a60b0b785fe0922ac351cb4f00d30b0d11e59
perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: e3f9c00dccedd21019d8f0048f2e6839e292200408af8d613c4fac1f9d176d1f
perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: e3f9c00dccedd21019d8f0048f2e6839e292200408af8d613c4fac1f9d176d1f
python-perf-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 9028c6fd98c6af5c2f500309e38a03e3fc68fea874f26ddb04587ff8c9529840
python-perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8545fdd989a2d7d45949da4756df9d1fc25d84196c2fdc071d09c22d372f1993
python-perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8545fdd989a2d7d45949da4756df9d1fc25d84196c2fdc071d09c22d372f1993

Red Hat Enterprise Linux Server - TUS 6.6

SRPM
kernel-2.6.32-504.64.4.el6.src.rpm SHA-256: 235d123905b461b39610fa08f97926ef153e8081bb0f877cba60baf6183ef118
x86_64
kernel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8a861ddecf0052b708032fecdbcc0d649f48dbafec1b6914ad343072f768d907
kernel-abi-whitelists-2.6.32-504.64.4.el6.noarch.rpm SHA-256: 3e22e8747355a832e3d95f1e6d83e091dce2fb4c59750ffe24d319450449d874
kernel-debug-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 94c1fb44b2944b0f229ef31442ced5f25215783c8617455b0fbd9ca7345b854f
kernel-debug-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 3adabe76c554fba3238814aec855f4a3646aea8b68efc8fae5024e765a0c54b4
kernel-debug-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 3adabe76c554fba3238814aec855f4a3646aea8b68efc8fae5024e765a0c54b4
kernel-debug-devel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: ebb85ce18acc4ce9e283f60afab2b98a4ff781983f90cde9cfd4c26e185b7188
kernel-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 503cf47cc3ccc9a6aaa3cdb26eded57873106b37928cea2f18e628a3b5f9fe15
kernel-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 503cf47cc3ccc9a6aaa3cdb26eded57873106b37928cea2f18e628a3b5f9fe15
kernel-debuginfo-common-x86_64-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: aa48352dc9cb0a1f6b532774a1a2fa815e3838f20aad5c47bc86bfb927c0d004
kernel-debuginfo-common-x86_64-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: aa48352dc9cb0a1f6b532774a1a2fa815e3838f20aad5c47bc86bfb927c0d004
kernel-devel-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: eb3604d4df79dffa6fb14a29a3d8d7cd21ad21a6ca6eed9e695184d2cbf27b18
kernel-doc-2.6.32-504.64.4.el6.noarch.rpm SHA-256: b9339b94f9753eb0e846d32007f32a86fe1f5f1ead1fbe197957f19f76edfcda
kernel-firmware-2.6.32-504.64.4.el6.noarch.rpm SHA-256: 2c994e164c7891ac8ab5b94940fdda3c1e47a4b7bc82b3ca1935140653abb121
kernel-headers-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: fcea6c2f95a207c2b884216d998326cbd2090c2f73a7f4ef761b00428be72f84
perf-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: d6b835da2cea19d2972b361c6f4a60b0b785fe0922ac351cb4f00d30b0d11e59
perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: e3f9c00dccedd21019d8f0048f2e6839e292200408af8d613c4fac1f9d176d1f
perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: e3f9c00dccedd21019d8f0048f2e6839e292200408af8d613c4fac1f9d176d1f
python-perf-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 9028c6fd98c6af5c2f500309e38a03e3fc68fea874f26ddb04587ff8c9529840
python-perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8545fdd989a2d7d45949da4756df9d1fc25d84196c2fdc071d09c22d372f1993
python-perf-debuginfo-2.6.32-504.64.4.el6.x86_64.rpm SHA-256: 8545fdd989a2d7d45949da4756df9d1fc25d84196c2fdc071d09c22d372f1993

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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