CVE-2010-4247: Citrix Xen

Medium severity, CVSS 5.5. EPSS: 0.7% chance of exploitation in the next 30 days.

The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before 3.4.0 for the Linux kernel 2.6.18, and possibly other versions, allows guest OS users to cause a denial of service (infinite loop and CPU consumption) via a large production request index to the blkback or blktap back-end drivers. NOTE: some of these details are obtained from third party information.

Affected products

• Citrix Xen: up to and including 3.3.2; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.1.3 only; version 3.1.4 only; …

Published 2011-01-11. Last modified 2026-06-16.