The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2015:2694 advisory.

    KVM (Kernel-based Virtual Machine) is a full virtualization solution for     Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the     user-space component for running virtual machines using KVM.

    A heap-based buffer overflow flaw was discovered in the way QEMU's AMD     PC-Net II Ethernet Controller emulation received certain packets in     loopback mode. A privileged user (with the CAP_SYS_RAWIO capability) inside     a guest could use this flaw to crash the host QEMU process (resulting in     denial of service) or, potentially, execute arbitrary code with privileges     of the host QEMU process. (CVE-2015-7504)

    A buffer overflow flaw was found in the way QEMU's AMD PC-Net II emulation     validated certain received packets from a remote host in non-loopback mode.
    A remote, unprivileged attacker could potentially use this flaw to execute     arbitrary code on the host with the privileges of the QEMU process.
    Note that to exploit this flaw, the guest network interface must have a     large MTU limit. (CVE-2015-7512)

    Red Hat would like to thank Qinghao Tang of QIHU 360 Marvel Team and Ling     Liu of Qihoo 360 Inc. for reporting the CVE-2015-7504 issue, and Ling Liu     of Qihoo 360 Inc. for reporting the CVE-2015-7512 issue. The CVE-2015-7512     issue was independently discovered by Jason Wang of Red Hat.

    All qemu-kvm users are advised to upgrade to these updated packages, which     contain backported patches to correct these issues. After installing this     update, shut down all running virtual machines. Once all virtual machines     have shut down, start them again for this update to take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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RHEL 6 : qemu-kvm (RHSA-2015:2694)

critical Nessus Plugin ID 87637

Version 2.13