-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2019:1485-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1485 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 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions. 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 Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server E4S (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.2) - noarch, 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. Bug Fix(es): * THP: Race between MADV_DONTNEED and NUMA hinting node migration code (BZ#1698103) * [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712989) * [RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712994) * WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713000) 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 Server AUS (v. 7.2): Source: kernel-3.10.0-327.79.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm Red Hat Enterprise Linux Server E4S (v. 7.2): Source: kernel-3.10.0-327.79.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 7.2): Source: kernel-3.10.0-327.79.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional E4S (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.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 iQIVAwUBXQfrL9zjgjWX9erEAQh8Yw//XDYZhLE+6/G5jELh43MDCVjixj/y8u2b RaMA/eOCJcq1MXV9k5XDruAeZWoMUcCV3OvBi4NIdQ4GXNb0idp3HvXUbAn6yxjh ANslnVZO8XTYFEpxdSGJf2DLVS+uwe+bnfgQQ6BTFJCDEfOAHsPv/d+jZF3qe2Hm WdD//r+U26C23e6Mz9nu1+k3fyScj+UCYCeIWLikKzboB5TmH1KDH7DS0p71JPKE 65I6b7W1ucj0SdvTpQH7VUesww+TM7KZHHwgo0Ydqusf+RoVyYbW3jbZGb+5m5aB tb8v/zaGsXBthKZmH6LCu02P+0Jbou8vEvqCztuwmqDocAeblm3mzeL8FerKCxCp obEEUcjsTbP+RDkNp2qjlfR6V11msl9PzTHXzrQw+7qxZodE9Jhv8Tvm3uTPvbi6 OTD9ez1Hkw5yaWIJBEitGLMxl4HjHaSXOLwbWkoQcEsv1ENmKtvz6wz64zefxljX VBPkLVuLGdwOzOlXHa9Oks3bWiKYUHt36R5sdz+uYL6NTCL5CLv8oUXCN5bYWRlU lCA6f5EYCR3Em8VFChAA51f+i688hmxq4sJwNtvoMVG96FwtVgSmmikb8cFN9+C+ qLlmaaC+b8cZ9COWfw2XAMkrFCYUNt7eL4W/vlZK+GkiYUxEYFZnJAqLXOWFgVpe nLvixkiNDOA=rUVR -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce