PT-2016-5958 · Linux+1 · Linux Kernel+1

Steve Rutherford + 1 · Published 2016-06-27 · Updated 2023-01-18 · CVE-2016-4440

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions through 4.6.3

Description The issue concerns the mishandling of the APICv on/off state in the Linux kernel, allowing guest OS users to obtain direct APIC MSR access on the host OS. This can lead to a denial of service (host OS crash) or possibly execute arbitrary code on the host OS via x2APIC mode.

Recommendations For Linux kernel versions through 4.6.3, update to a version later than 4.6.3 to resolve the issue. As a temporary workaround, consider disabling x2APIC mode until a patch is available. Restrict access to the APIC MSR to minimize the risk of exploitation.

Fix

DoS

Weakness Enumeration

CWE-264

Related Identifiers

ALT-PU-2016-1862

CVE-2016-4440

Affected Products

Alt Linux

Linux Kernel

References · 14

• https://github.com/torvalds/linux/commit/3ce424e45411cf5a13105e0386b6ecf6eeb4f66f · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-4440 · Security Note
• https://ubuntu.com/security/CVE-2016-4440 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ce424e45411cf5a13105e0386b6ecf6eeb4f66f · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2016-4440 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2016-4440 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2016-4440 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-4440 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-4440 · Vendor Advisory
• https://t.me/cvenotify/42202 · Telegram Post
• http://openwall.com/lists/oss-security/2016/05/20/2 · Note
• http://comments.gmane.org/gmane.comp.emulators.kvm.devel/152100 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1337806 · Note
• http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/152191 · Note