-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2019:1482-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1482 Issue date: 2019-06-17 CVE Names: CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.5 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. 7.5) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.5) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.5) - ppc64, ppc64le, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. 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: 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. 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/): 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 ComputeNode EUS (v. 7.5): Source: kernel-3.10.0-862.34.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-862.34.2.el7.noarch.rpm kernel-doc-3.10.0-862.34.2.el7.noarch.rpm x86_64: kernel-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.34.2.el7.x86_64.rpm kernel-devel-3.10.0-862.34.2.el7.x86_64.rpm kernel-headers-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-862.34.2.el7.x86_64.rpm perf-3.10.0-862.34.2.el7.x86_64.rpm perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm python-perf-3.10.0-862.34.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5): x86_64: kernel-debug-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-862.34.2.el7.x86_64.rpm perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.5): Source: kernel-3.10.0-862.34.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-862.34.2.el7.noarch.rpm kernel-doc-3.10.0-862.34.2.el7.noarch.rpm ppc64: kernel-3.10.0-862.34.2.el7.ppc64.rpm kernel-bootwrapper-3.10.0-862.34.2.el7.ppc64.rpm kernel-debug-3.10.0-862.34.2.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-debug-devel-3.10.0-862.34.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-862.34.2.el7.ppc64.rpm kernel-devel-3.10.0-862.34.2.el7.ppc64.rpm kernel-headers-3.10.0-862.34.2.el7.ppc64.rpm kernel-tools-3.10.0-862.34.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-tools-libs-3.10.0-862.34.2.el7.ppc64.rpm perf-3.10.0-862.34.2.el7.ppc64.rpm perf-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm python-perf-3.10.0-862.34.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm ppc64le: kernel-3.10.0-862.34.2.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debug-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-862.34.2.el7.ppc64le.rpm kernel-devel-3.10.0-862.34.2.el7.ppc64le.rpm kernel-headers-3.10.0-862.34.2.el7.ppc64le.rpm kernel-tools-3.10.0-862.34.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-tools-libs-3.10.0-862.34.2.el7.ppc64le.rpm perf-3.10.0-862.34.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm python-perf-3.10.0-862.34.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm s390x: kernel-3.10.0-862.34.2.el7.s390x.rpm kernel-debug-3.10.0-862.34.2.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-862.34.2.el7.s390x.rpm kernel-debug-devel-3.10.0-862.34.2.el7.s390x.rpm kernel-debuginfo-3.10.0-862.34.2.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-862.34.2.el7.s390x.rpm kernel-devel-3.10.0-862.34.2.el7.s390x.rpm kernel-headers-3.10.0-862.34.2.el7.s390x.rpm kernel-kdump-3.10.0-862.34.2.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-862.34.2.el7.s390x.rpm kernel-kdump-devel-3.10.0-862.34.2.el7.s390x.rpm perf-3.10.0-862.34.2.el7.s390x.rpm perf-debuginfo-3.10.0-862.34.2.el7.s390x.rpm python-perf-3.10.0-862.34.2.el7.s390x.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.s390x.rpm x86_64: kernel-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.34.2.el7.x86_64.rpm kernel-devel-3.10.0-862.34.2.el7.x86_64.rpm kernel-headers-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-862.34.2.el7.x86_64.rpm perf-3.10.0-862.34.2.el7.x86_64.rpm perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm python-perf-3.10.0-862.34.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.5): ppc64: kernel-debug-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-862.34.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-862.34.2.el7.ppc64.rpm perf-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debug-devel-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-862.34.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-862.34.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-862.34.2.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-862.34.2.el7.x86_64.rpm perf-debuginfo-3.10.0-862.34.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-862.34.2.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-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 iQIVAwUBXQfk3NzjgjWX9erEAQiytA/+LYuWZPA+XAzTGUtoSanvsTMhe3fdVmEs uC08ljrlPeR/Wd6nDM6/kA31tXy0DuL23ocXTXoz+eBQNzpv7wAV3BNegLB+EbaF lalFLRhneQHOPqVQm8NRM/+aQoUSPZGroINcBCxC+RRDCnzgd1IYYOPJeq3N3che 3/o1whqn8af/uYrE49Lg+qimRFPIDkUg/r+pTv8M/cWdskrDlv3ir8Dn3rczrg9C /MjRxlqayPLN60RsdQO1MJPIq/5/4avHbmlqYGvzWyqdMYZckJWtJbRcCNg4MaII P8sx7pW1h6MdC23tGdqdk1VsgPl5ap1qYDjIJdHkp2wOeih6Lk1ezBViRuOfWpx1 Wy2EpmGRy8IUA/biIHedki48cfBHE2T3Bd7dE0V1HHWP5c9iZIov5OTG6dvy5OMV bQA5+BVrSdrOPKj6VDwrbcDWoeSR8O0eMghoj7o3aP6cPzAMmQ2xxj8G4hrZuP0P 1eVZrMPgE+N6Brd9k/o70Gw90Q7N2o8ONJFrz+gFdIGxI+m3dNGhne5hwxou1Q+k 5/O4S3Eu2afic3WNh6K3Zbk8K5rzfqFGdOFEGYw0/lZblRgr9scVQdfo4ohoxabf ojkr1xsbNIcSxHYBm9LRM4cMXblFr+yx+mYZsCA539F2DKID42Y89msdcjGhOUEL SkhJ47gvUQ4=+jJe -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce