CVE-2016-9777

low-risk
Published 2016-12-28

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.

Do I need to act?

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0.07% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / HIGH complexity

Affected Products (1)

Affected Vendors

Linux

References (12)

Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=81cdb2...
Release Notes http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.12
Mailing List http://www.openwall.com/lists/oss-security/2016/12/02/2
Third Party Advisory http://www.securityfocus.com/bid/94640
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1400804
Patch https://github.com/torvalds/linux/commit/81cdb259fb6d8c1c4ecfeea389ff5a73c07f575...
Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=81cdb2...
Release Notes http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.12
Mailing List http://www.openwall.com/lists/oss-security/2016/12/02/2
Third Party Advisory http://www.securityfocus.com/bid/94640
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1400804
Patch https://github.com/torvalds/linux/commit/81cdb259fb6d8c1c4ecfeea389ff5a73c07f575...
25
/ 100
low-risk
Severity 20/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal