Race condition in the relinquish_memory function in arch/arm/domain.c in Xen 4.6.x and earlier allows local domains with partial management control to cause a denial of service (host crash) via vectors involving the destruction of a domain and using XENMEM_decrease_reservation to reduce the memory of the domain.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-7814
• https://security.gentoo.org/glsa/201604-03
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171249.html
• http://www.debian.org/security/2015/dsa-3414
• http://www.securitytracker.com/id/1034030
• http://xenbits.xen.org/xsa/advisory-147.html