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CVE-2011-2495

fs/proc/base.c in the Linux kernel before 2.6.39.4 does not properly restrict access to /proc/###...

2.1 LowFix available

fs/proc/base.c in the Linux kernel before 2.6.39.4 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.

Exploit likelihood

0.48%Down 0.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 2.1

fs/proc/base.c in the Linux kernel before 2.6.39.4 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.

Record
CVE-2011-2495
CVSS 2.0
2.1 LowAV:L/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-264
Updated
2026-11-02
CVE List No score

fs/proc/base.c in the Linux kernel before 2.6.39.4 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.

Record
CVE-2011-2495
Updated
2026-11-02
EUVDEUVD-2011-2482 No score

fs/proc/base.c in the Linux kernel before 2.6.39.4 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.

Record
EUVD-2011-2482
Updated
2026-11-03
GitHub AdvisoriesGHSA-qfq8-33vr-83jg No score

fs/proc/base.c in the Linux kernel before 2.6.39.4 does not properly restrict access to /proc/###...

fs/proc/base.c in the Linux kernel before 2.6.39.4 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.

Record
GHSA-qfq8-33vr-83jg
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
linux-2.6
Debian:6.0
 before 2.6.32-35squeeze1, plus listed versions
2.6.32-302.6.32-30+m68k.52.6.32-312.6.32-31~bpo50+12.6.32-32
Show 5 moreShow less
2.6.32-332.6.32-342.6.32-34squeeze12.6.32-352.6.32-35~bpo50+1
2.6.32-35squeeze1
linux-2.6
Debian:5.0
 before 2.6.26-26lenny4, plus listed versions
2.6.26-132.6.26-13lenny22.6.26-13lenny2~bpo40+12.6.26-142.6.26-15
Show 35 moreShow less
2.6.26-15lenny12.6.26-15lenny22.6.26-15lenny32.6.26-15~bpo40+12.6.26-15~bpo40+22.6.26-162.6.26-172.6.26-17lenny12.6.26-17lenny22.6.26-17lenny2~bpo40+12.6.26-17~bpo40+12.6.26-182.6.26-192.6.26-19lenny12.6.26-19lenny22.6.26-19~bpo40+12.6.26-202.6.26-20~bpo40+12.6.26-212.6.26-21lenny12.6.26-21lenny22.6.26-21lenny32.6.26-21lenny42.6.26-21~bpo40+12.6.26-222.6.26-22lenny12.6.26-232.6.26-242.6.26-24lenny12.6.26-252.6.26-25lenny12.6.26-262.6.26-26lenny12.6.26-26lenny22.6.26-26lenny3
2.6.26-26lenny4
kernel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-bootwrapper
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debug
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debug-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debug-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debuginfo-common-i686
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debuginfo-common-ppc64
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
Show 74 moreShow less
Affected packages
PackageAffectedFixed
kernel-debuginfo-common-s390x
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-doc
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-firmware
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-headers
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-kdump
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-kdump-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel-kdump-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
perf
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
perf-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-131.12.1.el6
0:2.6.32-131.12.1.el6
kernel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-doc
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-doc
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-kdump
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-kdump-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-kdump-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-274.3.1.el5
0:2.6.18-274.3.1.el5
kernel-rt
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-debug
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-debug-debuginfo
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-debug-devel
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-debuginfo
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-debuginfo-common-x86_64
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-devel
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-doc
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-firmware
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-trace
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-trace-debuginfo
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-trace-devel
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-vanilla
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-vanilla-debuginfo
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel-rt-vanilla-devel
Red Hat:enterprise_mrg:2:server:el6
 before 0:2.6.33.9-rt31.75.el6rt
0:2.6.33.9-rt31.75.el6rt
kernel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-PAE
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-PAE-debuginfo
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-PAE-devel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-debug
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-debug-debuginfo
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-debug-devel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-debuginfo
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-debuginfo-common
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-devel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-doc
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-kdump
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-kdump-debuginfo
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-kdump-devel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-xen
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-xen-debuginfo
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5
kernel-xen-devel
Red Hat:rhel_eus:5.6
 before 0:2.6.18-238.31.1.el5
0:2.6.18-238.31.1.el5

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2011-2495 is a low vulnerability (CVSS 2.1) in Linux Kernel, published September 8, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in linux-2.6 2.6.32-35squeeze1.

References

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