The PyGrub boot loader in Xen unstable before changeset
25589:60f09d1ab1fe, 4.2.x, and 4.1.x allows local para-virtualized
guest users to cause a denial of service (memory consumption) via a
large (1) bzip2 or (2) lzma compressed kernel image.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20121026 Xen Security Advisory 25 (CVE-2012-4544) - Xen domain builder Out-of-memory due to malicious kernel/ramdisk
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