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CVE-2016-8630

Status Candidate

Overview

The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M byte in an undefined instruction.

Related Files

Kernel Live Patch Security Notice LSN-0021-1
Posted Apr 15, 2017
Authored by Benjamin M. Romer

Several security issues were fixed in the kernel. Andrey Konovalov discovered that the AF_PACKET implementation in the Linux kernel did not properly validate certain block-size data. A local attacker could use this to cause a denial of service (system crash). Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2016-5195, CVE-2016-7910, CVE-2016-7911, CVE-2016-7912, CVE-2016-7916, CVE-2016-8399, CVE-2016-8630, CVE-2016-8633, CVE-2016-9191, CVE-2016-9555, CVE-2016-9756, CVE-2017-2583, CVE-2017-6074, CVE-2017-7308
MD5 | 878ad898ccfcd692664025f15c5ea754
Red Hat Security Advisory 2017-0387-01
Posted Mar 3, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0387-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: Linux kernel built with the Kernel-based Virtual Machine 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.

tags | advisory, x86, kernel
systems | linux, redhat
advisories | CVE-2016-8630, CVE-2016-8655, CVE-2016-9083, CVE-2016-9084
MD5 | cc2ebfe5262296af79965a8c1d83b9fa
Red Hat Security Advisory 2017-0386-01
Posted Mar 3, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0386-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: Linux kernel built with the Kernel-based Virtual Machine 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.

tags | advisory, x86, kernel
systems | linux, redhat
advisories | CVE-2016-8630, CVE-2016-8655, CVE-2016-9083, CVE-2016-9084
MD5 | 55415426738d7f1e95a8acb8f03bdb67
Ubuntu Security Notice USN-3162-2
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3162-2 - CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service. Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2016-6213, CVE-2016-7097, CVE-2016-7425, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9313, CVE-2016-9555
MD5 | a6a9494e971e706dbcde15b767dfb25a
Ubuntu Security Notice USN-3162-1
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3162-1 - CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service. It was discovered that the KVM implementation for x86/x86_64 in the Linux kernel could dereference a null pointer. An attacker in a guest virtual machine could use this to cause a denial of service in the KVM host. Various other issues were also addressed.

tags | advisory, denial of service, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9313, CVE-2016-9555
MD5 | 57d289ea1f6069da6a8aaa750fcfa8d5
Ubuntu Security Notice USN-3161-4
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-4 - Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. It was discovered that the Video For Linux Two implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-7097, CVE-2016-7425, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-8658, CVE-2016-9555, CVE-2016-9644
MD5 | 6e14161cd73c168795efc26ed7993e4a
Ubuntu Security Notice USN-3161-3
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-3 - Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. It was discovered that the Video For Linux Two implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-7042, CVE-2016-7097, CVE-2016-7425, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-8658, CVE-2016-9178, CVE-2016-9555
MD5 | 92c03c76e3e3979d62d79b96ba3d7866
Ubuntu Security Notice USN-3161-2
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-2 - USN-3161-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9555
MD5 | a697a392e6f577c06c48638a9a7d98db
Ubuntu Security Notice USN-3161-1
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-1 - Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. It was discovered that the Video For Linux Two implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9555
MD5 | 2512fbb6d503506880993f509d18ae31
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