CVE-2016-9777

Published: 28 December 2016

KVM in the Linux kernel before 4.8.12, when I/O APIC is enabled, does not properly restrict the VCPU index, which allows guest OS users to gain host OS privileges or cause a denial of service (out-of-bounds array access and host OS crash) via a crafted interrupt request, related to arch/x86/kvm/ioapic.c and arch/x86/kvm/ioapic.h.

From the Ubuntu Security Team

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel did not properly restrict the VCPU index when I/O APIC is enabled, An attacker in a guest VM could use this to cause a denial of service (system crash) or possibly gain privileges in the host OS.

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Status

Severity score breakdown

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1400804
• http://www.openwall.com/lists/oss-security/2016/12/02/2
• https://ubuntu.com/security/notices/USN-3190-1
• https://ubuntu.com/security/notices/USN-3190-2
• https://www.cve.org/CVERecord?id=CVE-2016-9777
• NVD
• Launchpad
• Debian