Vulnerability Details : CVE-2016-4440
arch/x86/kvm/vmx.c in the Linux kernel through 4.6.3 mishandles the APICv on/off state, which allows guest OS users to obtain direct APIC MSR access on the host OS, and consequently cause a denial of service (host OS crash) or possibly execute arbitrary code on the host OS, via x2APIC mode.
Vulnerability category: Execute codeDenial of service
Products affected by CVE-2016-4440
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-4440
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 24 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-4440
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2016-4440
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-4440
-
https://github.com/torvalds/linux/commit/3ce424e45411cf5a13105e0386b6ecf6eeb4f66f
kvm:vmx: more complete state update on APICv on/off · torvalds/linux@3ce424e · GitHubVendor Advisory
-
http://www.openwall.com/lists/oss-security/2016/05/20/2
oss-security - CVE-2016-4440 Kernel: kvm: vmx: incorrect state update leading to MSR accessMailing List
-
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ce424e45411cf5a13105e0386b6ecf6eeb4f66f
kernel/git/torvalds/linux.git - Linux kernel source treeVendor Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1337806
1337806 – (CVE-2016-4440) CVE-2016-4440 Kernel: kvm: vmx: incorrect state update leading to MSR accessIssue Tracking
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