-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2776-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2776 Issue date: 2018-09-25 CVE Names: CVE-2018-5390 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended 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 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 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) 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) 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/): 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) 6. 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/ 7. References: https://access.redhat.com/security/cve/CVE-2018-5390 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 iQIVAwUBW6qe0NzjgjWX9erEAQifnQ//Yjt7BtzIu5kCLW7RctFFx62Ny8fJUuZ0 sLah6bMbzFmLPMvHLyrOY7W532MtFMuObhzumKzSlprP0eGYNmlz9XAxTrYD63bQ RRBHqyT0cjFYxRrtJx4S7oriE3x2jRmrcRFlmlN8Bl18XO+fieihrOH547AmXlrl eb/n0g//94pEfXiIbh9UWOqCw5jWTpk0R46Tl/i+ky4SrysGDDd1SzWP8+hnE+ps BSDZD6ubYM2T7qunnYZ0Ci7LbfMxFNtLedZvG9dO8Ywlqfif5RNNFXfXp7WvYRzb RBzcrSX+FdtY/XCn7ov3WkH32kadtx2Q7vvrA/eLdwYt+6BaGKMmU7yc+zOIsZpA 2uJUO7AYm3p9J4SW4hpxmuw3er4g+bSHGuXg8Nz6kWVyWrMzILAXQYDUDwI66rTy EZXbRaOJCFY3+vYSHKAcZRHnroSOsIq/EotegjqFN4fcSVMSNNlOeoRop7pr3kQq eWlpbaDcWiE7CA5camN4aO0doj25vIdIyT4E8B+QBP7AC5FcF94CpQkyb2htut5o 0usFXhzZSze2MxeECwIf74/1QrF+kcgcLbwBJw/k0COoJ0qLTnEOsAjMJNNR4+0N JrZ2SQAwYs/QbIGVJTGvyfVhNYnnr+EW5/nrBiZU6DokA3q6rEI/Tg4Q8OIx0wwX j4HjKybGYpU:wj -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce