-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel-alt security update Advisory ID: RHSA-2019:1602-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1602 Issue date: 2019-06-25 CVE Names: CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary: An update for kernel-alt 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 for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le 3. Description: The kernel-alt packages provide the Linux kernel version 4.x. 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 for ARM and IBM Power LE (POWER9) Server (v. 7): Source: kernel-alt-4.14.0-115.8.2.el7a.src.rpm aarch64: kernel-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debug-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debug-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debug-devel-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debuginfo-common-aarch64-4.14.0-115.8.2.el7a.aarch64.rpm kernel-devel-4.14.0-115.8.2.el7a.aarch64.rpm kernel-headers-4.14.0-115.8.2.el7a.aarch64.rpm kernel-tools-4.14.0-115.8.2.el7a.aarch64.rpm kernel-tools-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-tools-libs-4.14.0-115.8.2.el7a.aarch64.rpm perf-4.14.0-115.8.2.el7a.aarch64.rpm perf-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm python-perf-4.14.0-115.8.2.el7a.aarch64.rpm python-perf-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm noarch: kernel-abi-whitelists-4.14.0-115.8.2.el7a.noarch.rpm kernel-doc-4.14.0-115.8.2.el7a.noarch.rpm ppc64le: kernel-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-bootwrapper-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debug-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debug-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debuginfo-common-ppc64le-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-devel-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-headers-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-tools-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-tools-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-tools-libs-4.14.0-115.8.2.el7a.ppc64le.rpm perf-4.14.0-115.8.2.el7a.ppc64le.rpm perf-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm python-perf-4.14.0-115.8.2.el7a.ppc64le.rpm python-perf-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm s390x: kernel-4.14.0-115.8.2.el7a.s390x.rpm kernel-debug-4.14.0-115.8.2.el7a.s390x.rpm kernel-debug-debuginfo-4.14.0-115.8.2.el7a.s390x.rpm kernel-debug-devel-4.14.0-115.8.2.el7a.s390x.rpm kernel-debuginfo-4.14.0-115.8.2.el7a.s390x.rpm kernel-debuginfo-common-s390x-4.14.0-115.8.2.el7a.s390x.rpm kernel-devel-4.14.0-115.8.2.el7a.s390x.rpm kernel-headers-4.14.0-115.8.2.el7a.s390x.rpm kernel-kdump-4.14.0-115.8.2.el7a.s390x.rpm kernel-kdump-debuginfo-4.14.0-115.8.2.el7a.s390x.rpm kernel-kdump-devel-4.14.0-115.8.2.el7a.s390x.rpm perf-4.14.0-115.8.2.el7a.s390x.rpm perf-debuginfo-4.14.0-115.8.2.el7a.s390x.rpm python-perf-4.14.0-115.8.2.el7a.s390x.rpm python-perf-debuginfo-4.14.0-115.8.2.el7a.s390x.rpm Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7): aarch64: kernel-debug-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-debuginfo-common-aarch64-4.14.0-115.8.2.el7a.aarch64.rpm kernel-tools-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm kernel-tools-libs-devel-4.14.0-115.8.2.el7a.aarch64.rpm perf-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm python-perf-debuginfo-4.14.0-115.8.2.el7a.aarch64.rpm noarch: kernel-doc-4.14.0-115.8.2.el7a.noarch.rpm ppc64le: kernel-debug-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debug-devel-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-debuginfo-common-ppc64le-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-tools-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm kernel-tools-libs-devel-4.14.0-115.8.2.el7a.ppc64le.rpm perf-debuginfo-4.14.0-115.8.2.el7a.ppc64le.rpm python-perf-debuginfo-4.14.0-115.8.2.el7a.ppc64le.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 iQIVAwUBXRJjQ9zjgjWX9erEAQhIyQ/8C7I/t2yuVGxAcNl/67MdMXuERfm3fDQn 3ySPu8pACAExHc4P0gbBFd5qr+4dLj8aCoSvpeprYogRN2HvP3fSD3HAnqawn/ZC 1xRVk8i8KTt/XcYTkzw4hlvqbWBpzJ6RRqPT/hC2WhwIYvbfqQECkOydmmPD9OYr PDPLJXF+9UQ6MmGeuzS9UHWSrnx6/MCjln2bESBd7jfEyztIgY/MLI1MtRjN2vv/ 6zksEyr3721EPEFB5k3xhQlqAobcHcfSFx/70H845ZTwidSojumAs6pcuA4U6Cgd k8TKpshHKVolxfYz55+RsHGHy9m1ZRDOdVCNoIeCABC7F4YtP7LWoYqxvZzzSnb8 y6WNNQizJZocKxpAXB4b6TCfkurlqBarN+3b5E213WLaDbhGoqoNfCEDxg9KEvCI e2Jq9bN18MM1bmEEvpxR0+/IBsrPJst71ookhuxH7gR7fcTnptdHbVlNaBf9aGo2 gw6UCtVt2LcXE3qqZSQUWXVpYwdyBD5vI8njO+dojckctvAuB+YU2b28AowtPY7O z5EwiJZe0HLPlK9maVQ3GGUKizv7h/GW2lyzI2k1R72Ztnac4YuujqH/2TxuquDX rp2Nf6EmB4SDf6kkzNu6hXGqBdCvU4clmc+9bOoLVZFf0V/nQVoBNZ+NR2yPIfHC CyYIXTBPoOU=V+ia -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce