Skip to content
Fencer Intel
medium 5.5

CVE-2011-2901 json

Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (ho…

published 2013-10-01 13 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2874

cvss
5.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.

Patch / fix

  • kernel RHEL 5 2.6.18-274.3.1.el5
  • kernel-PAE RHEL 5 2.6.18-274.3.1.el5
  • kernel-xen RHEL 5 2.6.18-274.3.1.el5
  • kernel-kdump RHEL 5 2.6.18-274.3.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-274.3.1.el5
  • kernel RHEL 5.6 EUS 2.6.18-238.31.1.el5
  • kernel-PAE RHEL 5.6 EUS 2.6.18-238.31.1.el5
  • kernel-xen RHEL 5.6 EUS 2.6.18-238.31.1.el5

red hat advisories RHSA-2011:1813RHSA-2011:1212

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-2011-2901 updated cvss 5.5

kernel: xen: off-by-one shift in x86_64 __addr_ok()

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.3.1.el5, kernel-PAE 2.6.18-274.3.1.el5, kernel-xen 2.6.18-274.3.1.el5, kernel-kdump 2.6.18-274.3.1.el5, kernel-debuginfo-common 2.6.18-274.3.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.3.1.el5, kernel-PAE 2.6.18-274.3.1.el5, kernel-xen 2.6.18-274.3.1.el5, kernel-kdump 2.6.18-274.3.1.el5, kernel-debuginfo-common 2.6.18-274.3.1.el5
    fixed: vendor fix RHSA-2011:1212
  • Red Hat Enterprise Linux EUS (v. 5.6 server) kernel 2.6.18-238.31.1.el5, kernel-PAE 2.6.18-238.31.1.el5, kernel-xen 2.6.18-238.31.1.el5, kernel-kdump 2.6.18-238.31.1.el5, kernel-debuginfo-common 2.6.18-238.31.1.el5
    fixed: vendor fix RHSA-2011:1813

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

0.59% chance of exploitation in the next 30 days, higher than 48% 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-399 Resource Management Errors

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.