Improper input validation in Linux Kernel
CVE-2018-18021
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04
- Debian Linux — versions 9.0
Weakness classification (CWE)
References
- usn.ubuntu.com/3821-1/ (vendor-advisory, Third Party Advisory)
- github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279 (Patch)
- www.openwall.com/lists/oss-security/2018/10/02/2 (Patch, Mailing List, Third Party Advisory)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12 (Patch)
- access.redhat.com/errata/RHSA-2018:3656 (vendor-advisory, Third Party Advisory)
- github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d (Patch)
- www.securityfocus.com/bid/105550 (VDB Entry, Third Party Advisory, vdb-entry)
- usn.ubuntu.com/3821-2/ (vendor-advisory, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch)
Frequently asked questions
- What is CVE-2018-18021?
- CVE-2018-18021 is a high-severity vulnerability in Linux Kernel, classified under Improper Input Validation. CVSS score: 7.1/10. Published 2018-10-07.
- How severe is CVE-2018-18021?
- High severity. CVSS v3 base score is 7.1 out of 10.