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Fencer Intel
medium 5.5

CVE-2010-4247 json

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 kern…

published 2011-01-11 15 y ago modified 2026-06-16 4 mo ago also EUVD-2010-4220

cvss
5.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 5 2.6.18-194.32.1.el5
  • kernel-PAE RHEL 5 2.6.18-194.32.1.el5
  • kernel-xen RHEL 5 2.6.18-194.32.1.el5
  • kernel-kdump RHEL 5 2.6.18-194.32.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-194.32.1.el5

red hat advisories RHSA-2011:0004

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2010-4247 updated cvss 5.5

xen: request-processing loop is unbounded in blkback

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-194.32.1.el5, kernel-PAE 2.6.18-194.32.1.el5, kernel-xen 2.6.18-194.32.1.el5, kernel-kdump 2.6.18-194.32.1.el5, kernel-debuginfo-common 2.6.18-194.32.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-194.32.1.el5, kernel-PAE 2.6.18-194.32.1.el5, kernel-xen 2.6.18-194.32.1.el5, kernel-kdump 2.6.18-194.32.1.el5, kernel-debuginfo-common 2.6.18-194.32.1.el5
    fixed: vendor fix RHSA-2011:0004

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.5 AV:A/AC:L/Au:S/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.