Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.

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):

• 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, 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#1618386)

Solution

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server - AUS 7.2 x86_64
• Red Hat Enterprise Linux Server - TUS 7.2 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.2 x86_64

Fixes

• BZ - 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)

CVEs

• CVE-2018-5390

References

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

Red Hat Enterprise Linux Server - AUS 7.2

SRPM
kernel-3.10.0-327.73.1.el7.src.rpm	SHA-256: 9f643a05cc904c80f77c05d12749e2a7fdb12cde285ed4ecb156c3242bea7d64
x86_64
kernel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8f88a19b6e0bca5396ae60b4e94d523f975de5fd58f29eeb54b793a614c4330e
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 94da42c7cf41649e506683855dbe9f107c853fafc4ed0cd6057010f3e9daea75
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: eb646c65d55f772236b8a45fc5c32305566b132cb888f3e63350d8ae343cf958
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 36ad4b21b005e15c0dc33562b0a0a6b17af80e8277ebc8734144b81f2a868bcf
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 904ef09fa6fe9120abca0d9e801d64eed73ab0b3a127a7bf1fc3fa0a0fedbde5
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 92b89f70acff8a87e4fe2992dd7ec3872e652e0d6f1eaa1cbca9f840d83cd305
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: ed912d4f4284a6f71785a12d8e0b07b5fdd099d58b7bd3e3f779c986a6e995e3
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 5dc9faa67c44dfafc10e71a27a14a94a6d296b85553722bf2f46aea89dd8c63f
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 823f4e7eac314e88355a80f2fbc5d747ca2ee08463b85c4efdb8d9da8154dbf1
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e976f9265d157ec8d353cb04e573da3d4d40bec01652ed4d60da0462302227d6
perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8c1c94524f502d32722c44f4161efe2d1f46d6025df52ac5f3a40f1d9e8ae4fa
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
python-perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 34b360bccfd1545cd3e7dc8b0c9a50c6a73472412ca4fd101d16bb3e16054b53
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196

Red Hat Enterprise Linux Server - TUS 7.2

SRPM
kernel-3.10.0-327.73.1.el7.src.rpm	SHA-256: 9f643a05cc904c80f77c05d12749e2a7fdb12cde285ed4ecb156c3242bea7d64
x86_64
kernel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8f88a19b6e0bca5396ae60b4e94d523f975de5fd58f29eeb54b793a614c4330e
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 94da42c7cf41649e506683855dbe9f107c853fafc4ed0cd6057010f3e9daea75
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: eb646c65d55f772236b8a45fc5c32305566b132cb888f3e63350d8ae343cf958
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 36ad4b21b005e15c0dc33562b0a0a6b17af80e8277ebc8734144b81f2a868bcf
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 904ef09fa6fe9120abca0d9e801d64eed73ab0b3a127a7bf1fc3fa0a0fedbde5
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 92b89f70acff8a87e4fe2992dd7ec3872e652e0d6f1eaa1cbca9f840d83cd305
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: ed912d4f4284a6f71785a12d8e0b07b5fdd099d58b7bd3e3f779c986a6e995e3
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 5dc9faa67c44dfafc10e71a27a14a94a6d296b85553722bf2f46aea89dd8c63f
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 823f4e7eac314e88355a80f2fbc5d747ca2ee08463b85c4efdb8d9da8154dbf1
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e976f9265d157ec8d353cb04e573da3d4d40bec01652ed4d60da0462302227d6
perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8c1c94524f502d32722c44f4161efe2d1f46d6025df52ac5f3a40f1d9e8ae4fa
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
python-perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 34b360bccfd1545cd3e7dc8b0c9a50c6a73472412ca4fd101d16bb3e16054b53
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196

Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.2

SRPM
kernel-3.10.0-327.73.1.el7.src.rpm	SHA-256: 9f643a05cc904c80f77c05d12749e2a7fdb12cde285ed4ecb156c3242bea7d64
x86_64
kernel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8f88a19b6e0bca5396ae60b4e94d523f975de5fd58f29eeb54b793a614c4330e
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 94da42c7cf41649e506683855dbe9f107c853fafc4ed0cd6057010f3e9daea75
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: eb646c65d55f772236b8a45fc5c32305566b132cb888f3e63350d8ae343cf958
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: d90dbf281862630aa737b3b43705a52f1d4a5ed36583975d16943ed9c0ce87c7
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 36ad4b21b005e15c0dc33562b0a0a6b17af80e8277ebc8734144b81f2a868bcf
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 4b4052cfe2b67a4f89c94de3ee5230bab28cf8d83cf685214f58ccee55df10f6
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: a2804346eed365d7015b6b7eb1d532b050a75b9b89f207b9dfdf21ce74adec85
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 904ef09fa6fe9120abca0d9e801d64eed73ab0b3a127a7bf1fc3fa0a0fedbde5
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm	SHA-256: 92b89f70acff8a87e4fe2992dd7ec3872e652e0d6f1eaa1cbca9f840d83cd305
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: ed912d4f4284a6f71785a12d8e0b07b5fdd099d58b7bd3e3f779c986a6e995e3
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 5dc9faa67c44dfafc10e71a27a14a94a6d296b85553722bf2f46aea89dd8c63f
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 2f91f058356f3b83cc291114421f7729c1352f951de67bef1dbfeb1f2ac63058
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 823f4e7eac314e88355a80f2fbc5d747ca2ee08463b85c4efdb8d9da8154dbf1
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e976f9265d157ec8d353cb04e573da3d4d40bec01652ed4d60da0462302227d6
perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 8c1c94524f502d32722c44f4161efe2d1f46d6025df52ac5f3a40f1d9e8ae4fa
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 407590b4b6518f68226dbd4d62c16037df081ba6ffba226283c9a7704e8fb679
python-perf-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: 34b360bccfd1545cd3e7dc8b0c9a50c6a73472412ca4fd101d16bb3e16054b53
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm	SHA-256: e74b4b693072b707558565a9ccc5d3b1b5ecc639ba032225d02d65f5156ad196