RedHat: RHSA-2018-2776:01 Important: kernel security and bug fix update
Summary
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
Security Fix(es):
* A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to tcp_collapse_ofo_queue()
and tcp_prune_ofo_queue() functions by sending specially modified packets
within ongoing TCP sessions which could lead to a CPU saturation and hence
a denial of service on the system. Maintaining the denial of service
condition requires continuous two-way TCP sessions to a reachable open
port, thus the attacks cannot be performed using spoofed IP addresses.
(CVE-2018-5390)
Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department
of Communications and Networking and Nokia Bell Labs) for reporting this
issue.
Bug Fix(es):
* Previously, making the total buffer size bigger than the memory size for
early allocation through the trace_buf_size boot option, made the system
become unresponsive at the boot stage. This update introduces a change in
the early memory allocation. As a result, the system no longer hangs in the
above described scenario. (BZ#1588365)
* When inserting objects with the same keys, made the rhlist implementation
corrupt the chain pointers. As a consequence, elements were missing on
removal and traversal. This patch updates the chain pointers correctly. As
a result, there are no missing elements on removal and traversal in the
above-described scenario. (BZ#1601008)
* Previously, the kernel source code was missing support to report the
Speculative Store Bypass Disable (SSBD) vulnerability status on IBM Power
Systems and the little-endian variants of IBM Power Systems. As a
consequence, the /sys/devices/system/cpu/vulnerabilities/spec_store_bypass
file incorrectly reported "Not affected" on both CPU architectures. This
fix updates the kernel source code to properly report the SSBD status
either as "Vulnerable" or "Mitigation: Kernel entry/exit barrier (TYPE)"
where TYPE is one of "eieio", "hwsync", "fallback", or "unknown".
(BZ#1612352)
* Previously, the early microcode updater in the kernel was trying to
perform a microcode update on virtualized guests. As a consequence, the
virtualized guests sometimes mishandled the request to perform the
microcode update and became unresponsive in the early boot stage. This
update applies an upstream patch to avoid the early microcode update when
running under a hypervisor. As a result, no kernel freezes appear in the
described scenario. (BZ#1618389)
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-2018-5390 https://access.redhat.com/security/updates/classification/#important
Package List
Red Hat Enterprise Linux ComputeNode EUS (v. 7.4):
Source:
kernel-3.10.0-693.39.1.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-693.39.1.el7.noarch.rpm
kernel-doc-3.10.0-693.39.1.el7.noarch.rpm
x86_64:
kernel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.39.1.el7.x86_64.rpm
perf-3.10.0-693.39.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):
x86_64:
kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.39.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.4):
Source:
kernel-3.10.0-693.39.1.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-693.39.1.el7.noarch.rpm
kernel-doc-3.10.0-693.39.1.el7.noarch.rpm
ppc64:
kernel-3.10.0-693.39.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debug-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.39.1.el7.ppc64.rpm
kernel-devel-3.10.0-693.39.1.el7.ppc64.rpm
kernel-headers-3.10.0-693.39.1.el7.ppc64.rpm
kernel-tools-3.10.0-693.39.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-693.39.1.el7.ppc64.rpm
perf-3.10.0-693.39.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
python-perf-3.10.0-693.39.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
ppc64le:
kernel-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debug-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-devel-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-headers-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-tools-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-693.39.1.el7.ppc64le.rpm
perf-3.10.0-693.39.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
python-perf-3.10.0-693.39.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
s390x:
kernel-3.10.0-693.39.1.el7.s390x.rpm
kernel-debug-3.10.0-693.39.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-693.39.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-693.39.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-693.39.1.el7.s390x.rpm
kernel-devel-3.10.0-693.39.1.el7.s390x.rpm
kernel-headers-3.10.0-693.39.1.el7.s390x.rpm
kernel-kdump-3.10.0-693.39.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-693.39.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-693.39.1.el7.s390x.rpm
perf-3.10.0-693.39.1.el7.s390x.rpm
perf-debuginfo-3.10.0-693.39.1.el7.s390x.rpm
python-perf-3.10.0-693.39.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.s390x.rpm
x86_64:
kernel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.39.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.39.1.el7.x86_64.rpm
perf-3.10.0-693.39.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.4):
ppc64:
kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.39.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-693.39.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm
ppc64le:
kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-693.39.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm
x86_64:
kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.39.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.39.1.el7.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 7.4Extended 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 ComputeNode EUS (v. 7.4) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, x86_64
Bugs Fixed
1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)