Public Date:
716825: CVE-2011-2495 kernel: /proc/PID/io infoleak

The MITRE CVE dictionary describes this issue as:

fs/proc/base.c in the Linux kernel before does not properly restrict access to /proc/#####/io files, which allows local users to obtain sensitive I/O statistics by polling a file, as demonstrated by discovering the length of another user's password.

Find out more about CVE-2011-2495 from the MITRE CVE dictionary dictionary and NIST NVD.


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 2.1
Base Metrics AV:L/AC:L/Au:N/C:P/I:N/A:N
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None

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 5 (kernel) RHSA-2011:1212 2011-09-06
Red Hat Enterprise Linux EUS (v. 5.6 server) (kernel) RHSA-2011:1813 2011-12-13
Red Hat Enterprise Linux version 6 (kernel) RHSA-2011:1189 2011-08-23
MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2011:1253 2011-09-12

Affected Packages State

Platform Package State
Red Hat Enterprise Linux EUS (v. 5.6 server) kernel Affected
Red Hat Enterprise Linux 4 kernel Will not fix


Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.