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Ubuntu Security Notice USN-2850-1
Posted Dec 20, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2850-1 - Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of service (crash the host) or potentially execute arbitrary code on the host. Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform sanity checks on the device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the host. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2015-8550, CVE-2015-8551, CVE-2015-8552
SHA-256 | 8801a20dfe670ed0777b0812cfbdf2656a6759e6e01895b49721cb6f391a893f

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