Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

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 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• 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, x86 AMD)
  
• kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message (CVE-2017-11600)
  

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 Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639.

Bug Fix(es):

• The kernel-rt packages have been upgraded to the 3.10.0-862.6.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1576058)

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 for Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

• BZ - 1474928 - CVE-2017-11600 kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message
• BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
• BZ - 1576058 - kernel-rt: update to the RHEL7.5.z batch#2 source tree

CVEs

• CVE-2017-11600
• CVE-2018-3639

References

• https://access.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-862.6.3.rt56.811.el7.src.rpm	SHA-256: adeb22c7f304616ad14f46d66b93b5baafb47a57327d073945ea078c94c10691
x86_64
kernel-rt-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 7a744ad9af04335e666cbcb2e0088ef4d5f7c7c707a97049da0676f32a4c77cc
kernel-rt-debug-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 1d0040576e442b2c34f8ef95a98777c61620656faae9d474b37b091a7c7d8790
kernel-rt-debug-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: f1e59d650e72cd950f485fe5e22e38a624709d20fe5cb6186980462b04dadef7
kernel-rt-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: ff1ccf3486ba69ef90e7192cf7f962cb1ffb2c2102482ab5b6954a33367a66c2
kernel-rt-doc-3.10.0-862.6.3.rt56.811.el7.noarch.rpm	SHA-256: 01dbf6a72599dedbd61861f44ee0d9c4dba563d20fb0a9d2cfa77fcc80740f39
kernel-rt-trace-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 01481985c888276b1ba6eee425017055b6365caeb2f5aca2e73817ff0f0bc7f7
kernel-rt-trace-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 83f3100856104c97168cfaf324fef19f16e0ef7b875ef2314616cabb7a869e17

Red Hat Enterprise Linux for Real Time for NFV 7

SRPM
kernel-rt-3.10.0-862.6.3.rt56.811.el7.src.rpm	SHA-256: adeb22c7f304616ad14f46d66b93b5baafb47a57327d073945ea078c94c10691
x86_64
kernel-rt-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 7a744ad9af04335e666cbcb2e0088ef4d5f7c7c707a97049da0676f32a4c77cc
kernel-rt-debug-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 1d0040576e442b2c34f8ef95a98777c61620656faae9d474b37b091a7c7d8790
kernel-rt-debug-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: f0e959217f17110faf0231fee0ebe59df4a9ec9fe1ac426583a213e564b90672
kernel-rt-debug-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: f1e59d650e72cd950f485fe5e22e38a624709d20fe5cb6186980462b04dadef7
kernel-rt-debug-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 5122391f364dd3c7eee1ad9522a717b3b669a661e90598a4595503d1e434ae2c
kernel-rt-debug-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: e3956ff0fbb8fa08508764e6f12b6fec5c6a9d5c3ed1520e4514b3d0189f0cad
kernel-rt-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: e1be2bd73736ed4812d9ad40130d3362ad1206f311805954be459a78e6b37051
kernel-rt-debuginfo-common-x86_64-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 5fa0a33b2dc834151ef5bfc1813c12edc707c2b9716b018bb957b0b0eed19aee
kernel-rt-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: ff1ccf3486ba69ef90e7192cf7f962cb1ffb2c2102482ab5b6954a33367a66c2
kernel-rt-doc-3.10.0-862.6.3.rt56.811.el7.noarch.rpm	SHA-256: 01dbf6a72599dedbd61861f44ee0d9c4dba563d20fb0a9d2cfa77fcc80740f39
kernel-rt-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: f5aabf6bba42af9e23aaff9396b799065213b350d33404db8031e21c8b7926d4
kernel-rt-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: dd628e006857a3ef55c8f6b5203437d03de0907a715b556ad855da7c516ad205
kernel-rt-trace-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 01481985c888276b1ba6eee425017055b6365caeb2f5aca2e73817ff0f0bc7f7
kernel-rt-trace-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 477aa8f2b472cb2288a582d4f014647ab4c5d823286e2ea5479947c45e8ee93a
kernel-rt-trace-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 83f3100856104c97168cfaf324fef19f16e0ef7b875ef2314616cabb7a869e17
kernel-rt-trace-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: a1e7086acb8f92c8f2101c66def3252ad9276c952ae968d32b94b2b54d4c26cc
kernel-rt-trace-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm	SHA-256: 10a8b5250a9763a085e25c8736e2ae3aab12b63b6e93d15f49ee5afa92f8ebc7