-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2019:1480-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1480 Issue date: 2019-06-17 CVE Names: CVE-2019-9213 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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 Real Time (v. 8) - x86_64 Red Hat Enterprise Linux Real Time for NFV (v. 8) - 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): * An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477) * kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms (CVE-2019-9213) * Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478) * Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955) 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/): 1686136 - CVE-2019-9213 kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms 1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service 1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service 1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service 6. Package List: Red Hat Enterprise Linux Real Time for NFV (v. 8): Source: kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.src.rpm x86_64: kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-kvm-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-kvm-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm Red Hat Enterprise Linux Real Time (v. 8): Source: kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.src.rpm x86_64: kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm kernel-rt-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.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-2019-9213 https://access.redhat.com/security/cve/CVE-2019-11477 https://access.redhat.com/security/cve/CVE-2019-11478 https://access.redhat.com/security/cve/CVE-2019-11479 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/tcpsack 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2019 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBXQfwlNzjgjWX9erEAQhMPBAAkWYolBh/2whNMOHTqfIAQkoxU+eCw1lt 2XuwJhFAs/LnDt/T2vyJCqOne94gqaT5Kzk0l/qcyXGVbvyiM883GpEiupmTj14C uecsuJntUNiSZhQZbLUtwBLPDKBavHu9N0qdYgOMpYOeqmd7b1xIRN3lAVkHo+MQ fDQ7xFbECey7DrBZiW12+wMPYEeLD2uABsh5LsRU+FdmGskBArrsQgs/vngxBQrD uWqqk5DxZ8eGu3HB4vkDzphGVPECWv2/W+5JRzir4SgfmMoYZsEMTmwT2M1SqDgH YioxEdefTBGk5oNMtf6zTG3FCIEs+VxlpUl0hTlcpEacA0rLVHonGz258oL8yc9d NDe2BCDrurbjNaJAOvRpTQcN7L0Swv6kf+la+YnuYtPVRV+WEoZZHXPlDa71ZWVD 968O/7VT0QyHIJZaT0kDoVPwPcg02k/bCSKo08HhwiMKTI+gU6075U8pTB/JayMt iRAFoPIBLwT5NWEJOxEHBmV1ka1sWhXdA6pFeg34VYDNJu9WlS61KXSsNOQerlBS rqo/647KBPyfd8311VkKg9nPfDReHIvugcE3gnZcjQGW9qq6HrsVw0giccD0IFUQ 8VisG4s8/zsg+uGWJGikr7Hcay813Kpyw8vbP/km0diqo6xayZvbxj99cSVePEgR dlUd6uBbIfQ=xWOA -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce