-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2017:0387-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0387.html Issue date: 2017-03-02 CVE Names: CVE-2016-8630 CVE-2016-8655 CVE-2016-9083 CVE-2016-9084 ===================================================================== 1. Summary: An update for kernel-rt 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 Realtime (v. 7) - noarch, x86_64 Red Hat Enterprise Linux for Real Time for NFV (v. 7) - 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): * Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support is vulnerable to a null pointer dereference flaw. It could occur on x86 platform, when emulating an undefined instruction. An attacker could use this flaw to crash the host kernel resulting in DoS. (CVE-2016-8630, Important) * A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system. (CVE-2016-8655, Important) * A flaw was discovered in the Linux kernel's implementation of VFIO. An attacker issuing an ioctl can create a situation where memory is corrupted and modify memory outside of the expected area. This may overwrite kernel memory and subvert kernel execution. (CVE-2016-9083, Important) * The use of a kzalloc with an integer multiplication allowed an integer overflow condition to be reached in vfio_pci_intrs.c. This combined with CVE-2016-9083 may allow an attacker to craft an attack and use unallocated memory, potentially crashing the machine. (CVE-2016-9084, Moderate) Red Hat would like to thank Philip Pettersson for reporting CVE-2016-8655. Bug Fix(es): * Previously, the asynchronous page fault woke code references spinlocks, which were actually sleeping locks in the RT kernel. Because of this, when the code was executed from the exception context, a bug warning appeared on the console. With this update, the regular wait queue and spinlock code in this area has been modified to use simple-wait-queue and raw-spinlocks. This code change enables the asynchronous page fault code to run in a non-preemptable state without bug warnings. (BZ#1418035) 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/): 1389258 - CVE-2016-9083 kernel: State machine confusion bug in vfio driver leading to memory corruption 1389259 - CVE-2016-9084 kernel: Integer overflow when using kzalloc in vfio driver 1393350 - CVE-2016-8630 kernel: kvm: x86: NULL pointer dereference during instruction decode 1400019 - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free 1415172 - kernel-rt: update to the RHEL7.3.z batch#3 source tree [rt-7.3.z] 6. Package List: Red Hat Enterprise Linux for Real Time for NFV (v. 7): Source: kernel-rt-3.10.0-514.10.2.rt56.435.el7.src.rpm noarch: kernel-rt-doc-3.10.0-514.10.2.rt56.435.el7.noarch.rpm x86_64: kernel-rt-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm Red Hat Enterprise Linux Realtime (v. 7): Source: kernel-rt-3.10.0-514.10.2.rt56.435.el7.src.rpm noarch: kernel-rt-doc-3.10.0-514.10.2.rt56.435.el7.noarch.rpm x86_64: kernel-rt-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-514.10.2.rt56.435.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-2016-8630 https://access.redhat.com/security/cve/CVE-2016-8655 https://access.redhat.com/security/cve/CVE-2016-9083 https://access.redhat.com/security/cve/CVE-2016-9084 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFYuIPXXlSAg2UNWIIRAmxKAJ9G4RRJGM0haoDf9p+7eqUmyCvBEgCgqZI9 1Tm4aHVEAyf+TPzZ+58RCb0= =0JLE -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce