-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2791-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2791 Issue date: 2018-09-25 CVE Names: CVE-2018-5390 CVE-2018-5391 CVE-2018-10675 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced 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. 2. Relevant releases/architectures: Red Hat Enterprise Linux Server AUS (v. 6.4) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64 3. 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) * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391) * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675) 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 Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390 and CVE-2018-5391. Bug Fix(es): * After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the "__max_smt_threads()" function has been fixed. As a result, both threads are now detected correctly in the described situation. (BZ#1625330) 4. 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. 5. Bugs fixed (https://bugzilla.redhat.com/): 1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) 1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack) 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.93.1.el6.src.rpm noarch: kernel-doc-2.6.32-358.93.1.el6.noarch.rpm kernel-firmware-2.6.32-358.93.1.el6.noarch.rpm x86_64: kernel-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm kernel-devel-2.6.32-358.93.1.el6.x86_64.rpm kernel-headers-2.6.32-358.93.1.el6.x86_64.rpm perf-2.6.32-358.93.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.93.1.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm python-perf-2.6.32-358.93.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.93.1.el6.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/ 7. References: https://access.redhat.com/security/cve/CVE-2018-5390 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW6qZaNzjgjWX9erEAQibRhAAi5R09yTV+fksTsSRN9whi9D5E66aqn/b MqKLbAKwTwPsleIKaUWpq/V3mLMbBeqpIAb67/HLpcG6vDB44AID4Nlr6xTgXFH8 G3LZkofjJuOj8Az4HTZATuogynhL+Wo4ajlqsMFucbfuBDs2wHIyhnpMo5aYiKor IaI1WFgC13Gj9pAYRasu87q5RLpX/FzC/mZt1C+Qq/PKlRxU3loL+P9y8cfzxmtg s/56cGpN7J4s12ztvHB7cdgiSWYQj0JrvL2htundCfAWrx1M3zUtyFjVBfakFF5N L7gv7ms+sTT2hsrFR2Z/2OF1cqhYaqwyc+aMxQT5Tz8JU642kyxhg8L1CMFkUBM0 qP1wF/HnSgwIrzT40grvagg+Ot9Gl4J/IJ/KUmi8ce24u30V/6WuA1FL60yly309 lzPS1vptFFvaKWMOMRWLGsU836wOy6XUIa2dlDMaOnWmgdCxNVhDYdrgkPAbZAJ0 IUFdb8G6d2919vIywpNcZR2N0xuM3mVl3FdsPmu1pt60YadtyGmPyYeyH4LjVul1 K0FpwlyGeFD0ZhR8MNhcWJgnycxrOlkft4X989PrDVEXqDdgOl4lGW9HJVGToLoJ dS8RWoZpvR+RNP1jhpZLj/kNUZ6qwBlz58LKjVBBdFGaLQrQ+sWHa9dbAF1C3oYj RzRcAsoet+k=3P7M -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce