PT-2016-7821 · Linux+2 · Linux Kernel+2

Dmitry Vyukov · Published 2016-12-05 · Updated 2023-05-16 · CVE-2016-9777

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.8.12

Description The issue allows guest OS users to gain host OS privileges or cause a denial of service, resulting in an out-of-bounds array access and host OS crash, via a crafted interrupt request when I/O APIC is enabled. This is related to the files arch/x86/kvm/ioapic.c and arch/x86/kvm/ioapic.h.

Recommendations For Linux kernel versions prior to 4.8.12, update to version 4.8.12 or later to resolve the issue. As a temporary workaround, consider disabling I/O APIC to minimize the risk of exploitation.

Fix

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2016-2405

CVE-2016-9777

USN-3190-1

USN-3190-2

Affected Products

Alt Linux

Linux Kernel

Ubuntu

References · 16

• https://github.com/torvalds/linux/commit/81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755 · Vendor Advisory
• http://openwall.com/lists/oss-security/2016/12/02/2 · Patch
• https://ubuntu.com/security/notices/USN-3190-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-9777 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-9777 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2016-9777 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-9777 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3190-2 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2016-9777 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-9777 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2016-9777 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1400804 · Note
• http://securityfocus.com/bid/94640 · Note
• http://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.12 · Note