NULL pointer dereference - CVE-2015-8551

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in Xen, when running on an x86 system and using Linux 3.1.x through 4.3.x as the driver domain, allows local guest administrators to hit BUG conditions and cause a denial of service (NULL pointer dereference and host OS crash) by leveraging a system with access to a passed-through MSI or MSI-X capable physical PCI device and a crafted sequence of XEN_PCI_OP_* operations, aka "Linux pciback missing sanity checks." <a href="http://cwe.mitre.org/data/definitions/476. A remote attacker can perform a denial of service (DoS) attack.

How to mitigate CVE-2015-8551

Sources

• http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00059.html
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
• http://www.debian.org/security/2016/dsa-3434
• http://www.securityfocus.com/bid/79546
• http://www.securitytracker.com/id/1034480
• http://xenbits.xen.org/xsa/advisory-157.html
• https://security.gentoo.org/glsa/201604-03