-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2019:1487-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://access.redhat.com/errata/RHSA-2019:1487 Issue date: 2019-06-17 CVE Names: CVE-2018-7566 CVE-2018-1000004 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 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): * 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: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566) * kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004) * 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): * update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1711010) 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/): 1535315 - CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service 1550142 - CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access 1711010 - update the MRG 2.5.z 3.10 kernel-rt sources 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 MRG Realtime for RHEL 6 Server v.2: Source: kernel-rt-3.10.0-693.50.3.rt56.644.el6rt.src.rpm noarch: kernel-rt-doc-3.10.0-693.50.3.rt56.644.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-693.50.3.rt56.644.el6rt.noarch.rpm x86_64: kernel-rt-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-693.50.3.rt56.644.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-2018-7566 https://access.redhat.com/security/cve/CVE-2018-1000004 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 iQIVAwUBXQfwnNzjgjWX9erEAQjn0hAAkIUHkJhvN9p7xlAkWsCvs3OZGch54LQJ aWiYcjJ4JzjYhXYSnmmtKmzFxDNrEEuHx9neoLpAus/vHf65i8azX61DeKBK5f0c rUtOEiXdcdf0LKtqGeYBhi2C+oduC6kUcqymX+FvYwAkalKN6EzzsAMCn7d6y/QT douPVqE+sH8D1iEn0ZnchiWy3t7kJbjOXlwTyGJTDpCRTqxjxMCt8Ae4I07ZrHX5 V5HMbKQOVtw+ZoIxC/nBqN2cJz0jk1oPqANG+7etcWpYxOcUgDmYvH83M0OwTEqi MrsqJqGVnSisyb9ro3U8O+WH8oS+iSIQXRfO1pqWoQT/76sVfnHCA+BkNz4DXwHi 4a8zSYrxBXI/cg3uTUAap5s6GNZSO/E+F8DbiCFv2SwdqIIKTcu1/VkcPhPXpWy6 +otMvn1hnmm9UIck7cZC6FIL4ehDTaBPqZfom7CDq6g2ShQq2S5iHG1ZDjpcKSKF fjNdR3JzEWSJRqLdsg3RFtizRyzL4PvjAzKKMQhL785lVM8e0bklaFQSD0uBbb7d wLVaoBUqE4wQDX332fYe2DSto1bRcov5XVmS/wk1VNDKc7Eu23v8GuAppw6m59nG AQ6ESv3oY1XMu0LAcpHOHsyY7iKVLgdDHluQWZ6B3T3KUFSSulr2aX4ipN9lvob1 TRi1X0+0ONQ=FNIF -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce