CVE-2016-3713 - Improper Access Control

Severity

55%

Complexity

39%

Confidentiality

130%

The msr_mtrr_valid function in arch/x86/kvm/mtrr.c in the Linux kernel before 4.6.1 supports MSR 0x2f8, which allows guest OS users to read or write to the kvm_arch_vcpu data structure, and consequently obtain sensitive information or cause a denial of service (system crash), via a crafted ioctl call.

The msr_mtrr_valid function in arch/x86/kvm/mtrr.c in the Linux kernel before 4.6.1 supports MSR 0x2f8, which allows guest OS users to read or write to the kvm_arch_vcpu data structure, and consequently obtain sensitive information or cause a denial of service (system crash), via a crafted ioctl call.

CVSS 3.0 Base Score 7.1. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).

CVSS 2.0 Base Score 5.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:N/A:C).

Overview

First reported 8 years ago

2016-06-27 10:59:00

Last updated 8 years ago

2016-06-27 17:57:00

Affected Software

Linux Kernel

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9842df62004f366b9fed2423e24df10542ee0dc5

Vendor Advisory

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.1

[oss-security] 20160516 CVE-2016-3713 Linux kernel: kvm: OOB r/w access issue with MSR 0x2F8

https://bugzilla.redhat.com/show_bug.cgi?id=1332139

https://github.com/torvalds/linux/commit/9842df62004f366b9fed2423e24df10542ee0dc5

Vendor Advisory

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