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CVE-2018-18021

Status Candidate

Overview

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

Related Files

Ubuntu Security Notice USN-3931-2
Posted Apr 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3931-2 - USN-3931-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS and for the Linux Azure kernel for Ubuntu 14.04 LTS. M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly set up all arguments to an error handler callback used when running as a paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-14678, CVE-2018-18021, CVE-2018-19824, CVE-2019-3460, CVE-2019-6974, CVE-2019-7221, CVE-2019-7222, CVE-2019-7308, CVE-2019-8912, CVE-2019-8980, CVE-2019-9213
MD5 | 9df4a9429f2b343c6821c2ba1bac6165
Ubuntu Security Notice USN-3931-1
Posted Apr 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3931-1 - M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly set up all arguments to an error handler callback used when running as a paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM could use this to cause a denial of service. It was discovered that the KVM implementation in the Linux kernel on ARM 64bit processors did not properly handle some ioctls. An attacker with the privilege to create KVM-based virtual machines could use this to cause a denial of service or execute arbitrary code in the host. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2018-14678, CVE-2018-18021, CVE-2018-19824, CVE-2019-3460, CVE-2019-6974, CVE-2019-7221, CVE-2019-7222, CVE-2019-7308, CVE-2019-8912, CVE-2019-8980, CVE-2019-9213
MD5 | 9f1f75dea510a42aad60524b705fc805
Slackware Security Advisory - Slackware 14.2 kernel Updates
Posted Jan 31, 2019
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New kernel packages are available for Slackware 14.2 to fix security issues.

tags | advisory, kernel
systems | linux, slackware
advisories | CVE-2017-18241, CVE-2017-18249, CVE-2018-10880, CVE-2018-1120, CVE-2018-12896, CVE-2018-13053, CVE-2018-13096, CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613, CVE-2018-14614, CVE-2018-14616, CVE-2018-14633, CVE-2018-16862, CVE-2018-16884, CVE-2018-17972, CVE-2018-18021, CVE-2018-18281, CVE-2018-18690, CVE-2018-18710, CVE-2018-19824, CVE-2018-19985
MD5 | 8236617ae0607e51011029f4f742813e
Red Hat Security Advisory 2018-3656-01
Posted Nov 27, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-3656-01 - The kernel-alt packages provide the Linux kernel version 4.x. Issues addressed include an use-after-free vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2018-17182, CVE-2018-18021
MD5 | 513600c8ce4902b46138d1c8a60bbcce
Ubuntu Security Notice USN-3821-2
Posted Nov 15, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3821-2 - USN-3821-1 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. Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-10880, CVE-2018-13053, CVE-2018-13096, CVE-2018-14609, CVE-2018-14617, CVE-2018-17972, CVE-2018-18021
MD5 | aec00b068e6349d4d19761befac301e0
Ubuntu Security Notice USN-3821-1
Posted Nov 15, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3821-1 - Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service. It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, overflow, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-10880, CVE-2018-13053, CVE-2018-13096, CVE-2018-14609, CVE-2018-14617, CVE-2018-17972, CVE-2018-18021
MD5 | a90659bad625eafc560423ef26975554
Debian Security Advisory 4313-1
Posted Oct 9, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4313-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2018-15471, CVE-2018-18021
MD5 | 5fd4d689901d47cfeb472487907f8ce0
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