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CVE-2016-9921

Status Candidate

Overview

Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS.

Related Files

Red Hat Security Advisory 2017-2408-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2408-01 - KVM is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Security Fix: Quick Emulator built with Network Block Device Server support was vulnerable to a null-pointer dereference issue. The flaw could occur when releasing a client that was not initialized due to failed negotiation. A remote user or process could exploit this flaw to crash the qemu-nbd server.

tags | advisory, remote
systems | linux, redhat
advisories | CVE-2016-10155, CVE-2016-4020, CVE-2016-6888, CVE-2016-7422, CVE-2016-7466, CVE-2016-8576, CVE-2016-8669, CVE-2016-8909, CVE-2016-8910, CVE-2016-9907, CVE-2016-9911, CVE-2016-9921, CVE-2016-9922, CVE-2017-5579, CVE-2017-5973, CVE-2017-6414, CVE-2017-8309, CVE-2017-8379, CVE-2017-9310, CVE-2017-9373, CVE-2017-9374, CVE-2017-9375, CVE-2017-9524
SHA-256 | 20c3d56cf43f3ca77bafe54885bbe8c3f543e06a0222599d837e53d50155a00d
Red Hat Security Advisory 2017-2392-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2392-01 - KVM is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. The following packages have been upgraded to a later upstream version: qemu-kvm-rhev. Security Fix: A stack buffer overflow flaw was found in the Quick Emulator built with the Network Block Device client support. The flaw could occur while processing server's response to a 'NBD_OPT_LIST' request. A malicious NBD server could use this issue to crash a remote NBD client resulting in DoS or potentially execute arbitrary code on client host with privileges of the QEMU process.

tags | advisory, remote, overflow, arbitrary
systems | linux, redhat
advisories | CVE-2016-10155, CVE-2016-4020, CVE-2016-6835, CVE-2016-6888, CVE-2016-7422, CVE-2016-7466, CVE-2016-8576, CVE-2016-8669, CVE-2016-8909, CVE-2016-8910, CVE-2016-9907, CVE-2016-9911, CVE-2016-9921, CVE-2016-9922, CVE-2017-2630, CVE-2017-5579, CVE-2017-5898, CVE-2017-5973, CVE-2017-9310, CVE-2017-9373, CVE-2017-9374, CVE-2017-9375
SHA-256 | 8bdef9a2edaa6c48acb02022865e43e9a79db08204a6fbb3afa3dc39b0a5c36a
Ubuntu Security Notice USN-3261-1
Posted Apr 20, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3261-1 - Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2016-10028, CVE-2016-10029, CVE-2016-10155, CVE-2016-7907, CVE-2016-8667, CVE-2016-8669, CVE-2016-9381, CVE-2016-9602, CVE-2016-9603, CVE-2016-9776, CVE-2016-9845, CVE-2016-9846, CVE-2016-9907, CVE-2016-9908, CVE-2016-9911, CVE-2016-9912, CVE-2016-9913, CVE-2016-9914, CVE-2016-9915, CVE-2016-9916, CVE-2016-9921, CVE-2016-9922, CVE-2017-2615, CVE-2017-2620, CVE-2017-2633, CVE-2017-5525, CVE-2017-5526, CVE-2017-5552
SHA-256 | 59e4c93cf0110c0dfbf04c8437a5671ce02bce5e5d84b925280c13d41fc38a3b
Gentoo Linux Security Advisory 201701-49
Posted Jan 23, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201701-49 - Multiple vulnerabilities have been found in QEMU, the worst of which could cause a Denial of Service condition. Versions less than 2.8.0 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2016-10028, CVE-2016-9101, CVE-2016-9776, CVE-2016-9845, CVE-2016-9846, CVE-2016-9907, CVE-2016-9908, CVE-2016-9911, CVE-2016-9912, CVE-2016-9913, CVE-2016-9914, CVE-2016-9915, CVE-2016-9916, CVE-2016-9921, CVE-2016-9923
SHA-256 | 0e2d539d14e347d3bf17b029ab30f28001e77ddbe1f75f7299d20d446e40dd7d
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