-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2018:2396-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://access.redhat.com/errata/RHSA-2018:2396 Issue date: 2018-08-14 CVE Names: CVE-2018-3620 CVE-2018-3639 CVE-2018-3646 ==================================================================== 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): * Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-3620, CVE-2018-3646) * An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639) Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-693.37.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1599860) 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/): 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass 1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF) 1599860 - update the MRG 2.5.z 3.10 kernel-rt sources 6. Package List: Red Hat MRG Realtime for RHEL 6 Server v.2: Source: kernel-rt-3.10.0-693.37.4.rt56.629.el6rt.src.rpm noarch: kernel-rt-doc-3.10.0-693.37.4.rt56.629.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-693.37.4.rt56.629.el6rt.noarch.rpm x86_64: kernel-rt-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-693.37.4.rt56.629.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-2018-3620 https://access.redhat.com/security/cve/CVE-2018-3639 https://access.redhat.com/security/cve/CVE-2018-3646 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/L1TF 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW3M4w9zjgjWX9erEAQh8lw/9FyrzpRw61TCQREvdv34B42tjRgoXNn+V qQvqSXu9RLnZeQqKmpDAtltnyuukpm2DgQd85aXOz/k0oA1QjmAtd6k9h1ohI2Gr H1HNFMqmy4FuWWuohQm7QF9jA4BW6pC/8Xe0CHPQ0BUVAlSVRHv7TPZbDXzaGjwR 4Y5i2OjUs6/LM1nNMAN81XficCoL5fqS0eR7rdvZdml4Z1ktmEXQ8nrnjlsIT8i3 BCSeLTgEaiMdjAa08w+Rp0X6ATM9a3JZNG7aF/3Wr7BhkICwH/aLxKI+xIb67Ch8 UF6APExCOzfEF+mfaup++WBYrnEc0TMInMUv6GKXzjfwvlrWm+ZI4kaAWS6I3yA5 4rBDrfz0eXdRyvWDzO+b6urBEe6jGkUgJUhon3vDHoM6UmVqgFLmsvamO46I8Wm+ cbbtLSFEn2rqhOKuQgM8EKrRy9inikrH2nHb5lguHnKWgCysz2/9OOy+jHPuBUkW YgYf4q6BRvzRUXtRDuTyXj1htqD9MouwBxl9dsbC4x+/sMHwSwlSxDPkQPdlw/c/ vvKih/vg+j+kbcr5tEV3RUWkZwR6psX4ciFCBbHhE8pyMTpxYiKEjP09d4699QAL 1++Rp+G8Ldb3hg6QcfhcNFkIGkmEKBBd5iy/uTteMKL40ayunNU7/7d2Bpq3GU65 6jw5Cs9mf9o=lNCX -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce