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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
SHA-256 | 3da25881795c75e4bb949d560d025be98c843cd588e2826360ca5c71e4e66c69
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
SHA-256 | 8648907b306a30de1b668a41a8ae79574d61f4eeddb6db9b310b4966103ace78
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
SHA-256 | b00c9750a9d1a5293cf1b00be4962a74b7a8b39c5ae241b16f2e5d2e209b667b
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
SHA-256 | 138d3b2eb90b7429ef67ed1169a8e658e887b799fbbaab3eeed73288fade789c
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
SHA-256 | 2b45d9df391d578d2bf6120f0c3781be981c031e4fcd0cab749bd0c70ec71961
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
SHA-256 | 254ad91732f674016cc8c241e3bd94844f31ec3b8f719729a95810b24cec4ab4
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
SHA-256 | 797c41de95f8733f3df28d404c9d017668eebeaf3d6c62c025040cbb65ffd1ee
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