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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2888 Important: kernel-rt security and bug fix update 26 September 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel-rt Publisher: Red Hat Operating System: Red Hat Impact/Access: Root Compromise -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-14634 CVE-2018-5390 Reference: ASB-2018.0222 ASB-2018.0221 ESB-2018.2287.2 ESB-2018.2278 ESB-2018.2275 ESB-2018.2271 Original Bulletin: https://access.redhat.com/errata/RHSA-2018:2789 https://access.redhat.com/errata/RHSA-2018:2763 Comment: This bulletin contains two (2) Red Hat security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2018:2789-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://access.redhat.com/errata/RHSA-2018:2789 Issue date: 2018-09-25 CVE Names: CVE-2018-5390 ===================================================================== 1. Summary: 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. 2. Relevant releases/architectures: Red Hat MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64 3. 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 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): * The kernel-rt packages have been upgraded to the 3.10.0-693.39.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1616431) * Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1618466) 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) 1616431 - update the MRG 2.5.z 3.10 kernel-rt sources 1618466 - RT system hang due to wrong of rq's nr_running [MRG-RT] 6. Package List: Red Hat MRG Realtime for RHEL 6 Server v.2: Source: kernel-rt-3.10.0-693.39.1.rt56.629.el6rt.src.rpm noarch: kernel-rt-doc-3.10.0-693.39.1.rt56.629.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-693.39.1.rt56.629.el6rt.noarch.rpm x86_64: kernel-rt-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-693.39.1.rt56.629.el6rt.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 <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW6qY8tzjgjWX9erEAQjRShAAnmRkv6mo27RSa3mR4eLxu7ropKwD9Zfm YfD67ILqkL5SQc1XGK/q3HAsIrIK3HEvfvzeuBG7Z1HMKZPIfPDZdXD+AjQmsdvG oQumulHt8Ykcx798cCj6d0ZBpzu1se15tfiDlyyaSVscV+yYrGYatZkn1llqVEl5 Ab5sWkE3zHlm9aEWJn4WVluhjbOCb4LuUGyYBkMKpC4uF7bYLGQHG3nJ33YYKxzG DIuVCmuTSLyOh+If7RyQrTgf1QTTgfupHBZ1UkqRj5vV1mie4+1rSujQsCR4eFhz ngIp/kPaXedPFd26CxRrEMmdtV1fZvsvhTEgijEmlOVnmQURBcj068nqDafVIqXS t0Z/tiRUbauq+83qdrPS9y2YizwQfMC8/Ehos6deQ6ac2hTMgq2wqs/VKGgHjpe4 WAnh8y9Ii87bgQyZhHqBfuQtsQ2F0ABvQKcIrNFitiPxzfRXUT7PwOe1TnC1ZNIx qGpSCt2z4TzcvFHUghfnitbyBOJT/CCEIZnlI8kLl5809/94I9mbqfuYtDDN7qmv IdG2gQpiCM1agcGO2U+XZbmnBbex7gAkZtl2hE3uAWkjfKEZKA3f/pye/zHwFKko IrGagq3BrghsNcpEObEI+8IsLnMaFtLQfuEWHNn2yhFZFMSTtDmkD6mfHt+xIaKr V4OlIJQJyq8= =s8NF - -----END PGP SIGNATURE----- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2018:2763-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2763 Issue date: 2018-09-25 CVE Names: CVE-2018-14634 ===================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise Linux 7. 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 Realtime (v. 7) - noarch, x86_64 Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64 3. 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): * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634) 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 Qualys Research Labs for reporting this issue. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-862.14.3 source tree, which provides a number of bug fixes over the previous version. (BZ#1616429) * Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1617941) 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/): 1616429 - kernel-rt: update to the RHEL7.5.z batch#4 source tree 1617941 - RT system hang due to wrong of rq's nr_running [rhel-7.5.z] 1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function 6. Package List: Red Hat Enterprise Linux for Real Time for NFV (v. 7): Source: kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm noarch: kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm x86_64: kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm Red Hat Enterprise Linux Realtime (v. 7): Source: kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm noarch: kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm x86_64: kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.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-2018-14634 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW6qIfdzjgjWX9erEAQg3Lw/9EjfWvjsuDZkxkAsqu9u8EcGtGCm1j+WQ chSOCWXXf0BKLSKsEo8P/MeOukUh4zixlC1uWiZOKGrWHexv5wO0s8Vs7Y9c0RD5 gnATWYlwd8jyLOZGW0+b5D1xNa1jQX5Bjm/u+Fwc8BwX30HWjDK8QudPvhpUHA6e eRAbi20uwAhtyytIX9gwT6Sqdjq4Sa95WcAVzTorzuMEfxjGhPQypMd1AxBWLmeX zB/E8PVaO2wE87/R31yVYwwiZ+calB1kGzy3CtrGC/peihOzt2jXTyeZ+oynKdA3 /pz6VcbvnwAVjRCm3B20RU12sCQv0YeoGjZJL2qP0y1i0B8+4TlPGvHV5ZfZ0Z72 mu4hmeDgFiTDodmH2qpo5DCGFgnHDTzCBW7u+O1HLbkdEw/Q55I8uUfhnNtiRh9q bhJta2zV03faNKzZpM4dE/CweojjZmuEUzvuAcFxHi0eoaSYsI7zuLEbqk4NOi75 qlE+wiApMSqUT8woh2bcGykqQmSBAEtB5hrCiA0SC+hr/qzs4HFqDZTUmPcUCYt8 0R01xPkKW7+1YRA0YXjn1YnmBkuGoIGd2/hzbFpl3mXLE/RkAL95bVLXsmMaHNSv S9kB6dSFNFpbWZdb7tJGCx6nxOB6KEPoKGCvjHqQdhRNvWHlTTzUuAkyHdnlJJaH h4UUJfU6x/M= =zUnG - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW6rj0maOgq3Tt24GAQi1hRAA3kgXg32++pfoTs90Gt4UGrL4MxUBkbBq 61IzaDSwT6aUmXoz5xn7GE57MpddKccvKuyfv2vTL6w1KjTXjXtKoyuyuOHodJVM 6grHCFB+mqHhWfCAeR03FeFpniTde+OefCXx9j+nryFNZjc3wIyIGrTjW70dG7Oj D82Gzh1KVD8EZyqGkt4FlSVa4ptGZVu6vdM3CGS5o6w5oLIGGIzY1ulZN2PMuNda PR1zzZmTkA2/VVy50aSeYNw9Ux9pGW5FtzEexzV9Km8HrsoUhbDlGJy/zFR1SOgd wh28+hTVdEdc1xkfwiypkIBhNe8dh7vGyeS8/x7dzSVLfL0u8oLtVfdOQNJ0Hrgs q54BQnTcoRjEIPxWSDZl4C34h9y1/kotvfcT5csgw0KDgyJgOyAHwKK+JUJSbONk V+onDA8oB+i9l37sRoXlTeSOmvKBWn3QnI1y+Ir1T6HFzfYZh1cse26M8dsB9SBI T65lhQQzF4SdCpzL2/+MnNi9r6fsjyAus1tD2psevOjLng3LQXS65N1cLyV6+J3V 1t/8uaUGuPLZtS0VktXvhxeVu23SY6t4YgIVjehPTrUXzClPJkQBmy5Of8tasDBg 26s4zRY73pFKCiYhi/XMaCy+oWSG8jRVdolrunPcxEIwyMcmOqUna/7JV5rmPT3J dvzLU+7MHUc= =wkwt -----END PGP SIGNATURE-----