Vulnerability identifier: #VU41138

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-8369

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux kernel through 3.17.2 miscalculates the number of pages during the handling of a mapping failure, which allows guest OS users to cause a denial of service (host OS page unpinning) or possibly have unspecified other impact by leveraging guest OS privileges. NOTE: this vulnerability exists because of an incorrect fix for CVE-2014-3601.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.68, 3.1 - 3.1.10, 3.2 - 3.2.30, 3.3 - 3.3.8, 3.4 - 3.4.79, 3.5.1 - 3.5.7, 3.6 - 3.6.11, 3.7 - 3.7.10, 3.8.0 - 3.8.13, 3.9 - 3.9.11, 3.10 - 3.10.29, 3.11 - 3.11.10, 3.12 - 3.12.17, 3.13 - 3.13.11, 3.14 - 3.14.5, 3.15 - 3.15.8, 3.16.0 - 3.16.1, 3.17 - 3.17.1

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External links
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3d32e4dbe71374a6780eaf51d719d76f9a9bf22f
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
http://rhn.redhat.com/errata/RHSA-2015-0674.html
http://secunia.com/advisories/62326
http://secunia.com/advisories/62336
http://www.debian.org/security/2014/dsa-3093
http://www.openwall.com/lists/oss-security/2014/10/24/7
http://www.securityfocus.com/bid/70747
http://www.securityfocus.com/bid/70749
http://bugzilla.redhat.com/show_bug.cgi?id=1156518
http://github.com/torvalds/linux/commit/3d32e4dbe71374a6780eaf51d719d76f9a9bf22f
http://lkml.org/lkml/2014/10/24/460

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.