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 MRG 2.

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):

• A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer. (CVE-2018-12130)
  
• Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed processor structure called the 'processor store buffer'. As a result, an unprivileged attacker could use this flaw to read private data resident within the CPU's processor store buffer. (CVE-2018-12126)
  
• Microprocessors use a ‘load port’ subcomponent to perform load operations from memory or IO. During a load operation, the load port receives data from the memory or IO subsystem and then provides the data to the CPU registers and operations in the CPU’s pipelines. Stale load operations results are stored in the 'load port' table until overwritten by newer operations. Certain load-port operations triggered by an attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a timing side-channel. (CVE-2018-12127)
  
• Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. (CVE-2019-11091)
  
• kernel: Buffer overflow in firewire driver via crafted incoming packets (CVE-2016-8633)
  
• kernel: crypto: privilege escalation in skcipher_recvmsg function (CVE-2017-13215)
  
• Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation (CVE-2017-16939)
  
• kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c (CVE-2018-1068)
  
• kernel: Use-after-free due to race condition in AF_PACKET implementation (CVE-2018-18559)
  
• kernel: media: use-after-free in [tuner-xc2028] media driver (CVE-2016-7913)
  
• kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message (CVE-2017-11600)
  
• kernel: memory leak when merging buffers in SCSI IO vectors (CVE-2017-12190)
  
• kernel: Unallocated memory access by malicious USB device via bNumInterfaces overflow (CVE-2017-17558)
  
• Kernel: FPU state information leakage via lazy FPU restore (CVE-2018-3665)
  

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1692711)

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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1391490 - CVE-2016-8633 kernel: Buffer overflow in firewire driver via crafted incoming packets
• BZ - 1402885 - CVE-2016-7913 kernel: media: use-after-free in [tuner-xc2028] media driver
• BZ - 1474928 - CVE-2017-11600 kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message
• BZ - 1495089 - CVE-2017-12190 kernel: memory leak when merging buffers in SCSI IO vectors
• BZ - 1517220 - CVE-2017-16939 Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation
• BZ - 1525474 - CVE-2017-17558 kernel: Unallocated memory access by malicious USB device via bNumInterfaces overflow
• BZ - 1535173 - CVE-2017-13215 kernel: crypto: privilege escalation in skcipher_recvmsg function
• BZ - 1552048 - CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c
• BZ - 1585011 - CVE-2018-3665 Kernel: FPU state information leakage via lazy FPU restore
• BZ - 1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in AF_PACKET implementation
• BZ - 1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
• BZ - 1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
• BZ - 1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
• BZ - 1692711 - update the MRG 2.5.z 3.10 kernel-rt sources
• BZ - 1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)

CVEs

• CVE-2016-7913
• CVE-2016-8633
• CVE-2017-11600
• CVE-2017-12190
• CVE-2017-13215
• CVE-2017-16939
• CVE-2017-17558
• CVE-2018-1068
• CVE-2018-3665
• CVE-2018-12126
• CVE-2018-12127
• CVE-2018-12130
• CVE-2018-18559
• CVE-2019-11091

References

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

MRG Realtime 2

SRPM
kernel-rt-3.10.0-693.47.2.rt56.641.el6rt.src.rpm	SHA-256: b62a5a1a4900db38fd7009d14260e87315e56a3aed494f612407da704942423f
x86_64
kernel-rt-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: c3dc42d9192c070406abb387cb9bb2d8fda7d703b6cb7c85d320df4bdd3429f6
kernel-rt-debug-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 6aabbd554f3b4b2dd78eabaf1ea78628b4fe446da7c354ca36e723950e7ebb4c
kernel-rt-debug-debuginfo-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 92db2918c58476de3fa1c9a40e524d1447d31a3e6c1c32206bba75acc74ba233
kernel-rt-debug-devel-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: e4462d22afcf3728c32e24f63c1cf1010a4733cb9d09d65229e8449266504c07
kernel-rt-debuginfo-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 41e73dd362fe12d1ae61598880f40cf73318c6c43797cb8ed2246cd62eb24251
kernel-rt-debuginfo-common-x86_64-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 7652d96a9d58a384bc6a8a1866ae63e85cc6791b2bf8f9f9590dfb5e2304fe22
kernel-rt-devel-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: ccbaa91e0eb96e33dcb2d6820094ca3c280c724055d8f914b471471ef8e1f1bb
kernel-rt-doc-3.10.0-693.47.2.rt56.641.el6rt.noarch.rpm	SHA-256: 592f96164b068fc41dead1b7dc878f5420bda1d23a5b10a10cb4d142b1b321f2
kernel-rt-firmware-3.10.0-693.47.2.rt56.641.el6rt.noarch.rpm	SHA-256: a5cb26dbc0ebb488f6066182066256d555a13d305e817f04da8b9fa46a56b36c
kernel-rt-trace-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 298552c372e057bce7fffe0499883dfccb0c7850bd1d0734494389ae89a8d466
kernel-rt-trace-debuginfo-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 041dfb5307db5910a65260376153a463df2e9c26f5c24f6a321fa87d045f6338
kernel-rt-trace-devel-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 074350b780d831c44bd12ace76964786abae5ef338fc961c099470cf880c153b
kernel-rt-vanilla-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: 7354c6883f8b6cc9bad637c92fbf5adcc87d16df0aca40eccb14ef2ed06dfad0
kernel-rt-vanilla-debuginfo-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: fb19e2d009a869633c1e3f0f1f036a93ea209ba58299834de14c3cd1ac199216
kernel-rt-vanilla-devel-3.10.0-693.47.2.rt56.641.el6rt.x86_64.rpm	SHA-256: f223e07aae6813ec5be90b9bd1ee079883a6f51740c1fa6595a8a84360bd94ff