Public Date:
752375: CVE-2011-4127 kernel: possible privilege escalation via SG_IO ioctl

The MITRE CVE dictionary describes this issue as:

The Linux kernel before 3.2.2 does not properly restrict SG_IO ioctl calls, which allows local users to bypass intended restrictions on disk read and write operations by sending a SCSI command to (1) a partition block device or (2) an LVM volume.

Find out more about CVE-2011-4127 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue affects the Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, 6, and Red Hat Enterprise MRG. This has been addressed in Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG via,, and Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle,, therefore the fix for this issue is not currently planned to be included in the future updates.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 7.4
Base Metrics AV:A/AC:M/Au:S/C:C/I:C/A:C
Access Vector Adjacent Network
Access Complexity Medium
Authentication Single
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (kernel) RHSA-2011:1849 2011-12-22
Red Hat Enterprise Linux EUS (v. 5.6 server) (kernel) RHSA-2012:0358 2012-03-06
RHEV Hypervisor for RHEL-6 (rhev-hypervisor6) RHSA-2011:1850 2011-12-22
Red Hat Enterprise Linux version 5 (kernel) RHSA-2012:0107 2012-02-09
MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2012:0333 2012-02-23

Affected Packages State

Platform Package State
Red Hat Enterprise Linux EUS (v. 5.6 server) kernel Affected
Red Hat Enterprise Linux 4 kernel Affected