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Bug 1230770 - (CVE-2015-4692) CVE-2015-4692 kernel: kvm x86: NULL pointer dereference in kvm_apic_has_events function
CVE-2015-4692 kernel: kvm x86: NULL pointer dereference in kvm_apic_has_event...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20150604,repor...
: Security
Depends On: 1230774
Blocks: 1230771
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Reported: 2015-06-11 10:04 EDT by Vasyl Kaigorodov
Modified: 2018-08-28 17:59 EDT (History)
33 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A DoS flaw was found for a Linux kernel built for the x86 architecture which had the KVM virtualization support(CONFIG_KVM) enabled. The kernel would be vulnerable to a NULL pointer dereference flaw in Linux kernel's kvm_apic_has_events() function while doing an ioctl. An unprivileged user able to access the "/dev/kvm" device could use this flaw to crash the system kernel.
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RHEL 7.3 requirements from Atomic Host:
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Description Vasyl Kaigorodov 2015-06-11 10:04:03 EDT 
Linux kernel built for the x86 architecture, with the KVM virtualisation support(CONFIG_KVM) is vulnerable to a NULL pointer dereference flaw. It could occur while doing KVM's Virtual CPU ioctl(2) call, in Linux kernel's kvm_apic_has_events() function.

An unprivileged user able to access "/dev/kvm" device, could use this flaw to crash the system kernel resulting in DoS.

Upstream fix:
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  -> https://lkml.org/lkml/2015/6/4/163

Reference:
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  -> http://seclists.org/oss-sec/2015/q2/680
Comment 1 Vasyl Kaigorodov 2015-06-11 10:08:41 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1230774]
Comment 2 Prasad J Pandit 2015-06-18 07:12:24 EDT 
Statement:

This issue does not affect the versions of Linux kernel as shipped with
Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.

This issue affects the version of the kernel package as shipped with
Red Hat Enterprise Linux 7.
Comment 3 Prasad J Pandit 2015-06-18 07:13:59 EDT 
This has been rated as having Moderate security impact and is not currently
planned to be addressed in future updates. For additional information, refer
to the Red Hat Enterprise Linux Life Cycle:

 -> https://access.redhat.com/support/policy/updates/errata/
Comment 5 Fedora Update System 2015-06-27 08:39:42 EDT 
kernel-4.0.6-300.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2015-06-30 16:12:47 EDT 
kernel-4.0.6-200.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Vasily Averin 2016-02-03 04:43:54 EST 
Please update description, seems it was fixed in RHEL7.2
https://access.redhat.com/labs/psb/versions/kernel-3.10.0-327.el7/patches/kvm-x86-fix-kvm_apic_has_events-to-check-for-NULL-pointer
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