kernel: /proc/PID/io infoleak
Published Jun 13, 2012
2.1
LOWCVSS 2.0
EPSS 0.48%
Description
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.
Affected products
No data.
- ≤ 2.6.39.3
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39
- 2.6.39.1
- 2.6.39.2
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-274.3.1.el5
Fixed · RHSA-2011:1212
Red Hat Enterprise Linux 5.6 EUS - Server Only
kernel-0:2.6.18-238.31.1.el5
Fixed · RHSA-2011:1813
Red Hat Enterprise Linux 6
kernel-0:2.6.32-131.12.1.el6
Fixed · RHSA-2011:1189
Red Hat Enterprise MRG 2
kernel-rt-0:2.6.33.9-rt31.75.el6rt
Fixed · RHSA-2011:1253
Red Hat Enterprise Linux 4
kernel
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-274.3.1.el5 | Fixed | RHSA-2011:1212 |
| Red Hat Enterprise Linux 5.6 EUS - Server Only | kernel-0:2.6.18-238.31.1.el5 | Fixed | RHSA-2011:1813 |
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-131.12.1.el6 | Fixed | RHSA-2011:1189 |
| Red Hat Enterprise MRG 2 | kernel-rt-0:2.6.33.9-rt31.75.el6rt | Fixed | RHSA-2011:1253 |
| Red Hat Enterprise Linux 4 | kernel | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1212.html, https://rhn.redhat.com/errata/RHSA-2011-1189.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.48% (0.00483) | 39.37th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.48% (0.00483) | 37.66th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.09% (0.00092) | 24.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.03% (0.01034) | 41.16th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.28% (0.01282) | 67.60th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.03% (0.01034) | 39.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
References (9)
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4 x_refsource_CONFIRM
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1d1221f375c94ef961ba8574ac4f85c8870ddd51 x_refsource_CONFIRM
- http://rhn.redhat.com/errata/RHSA-2011-1212.html vendor-advisoryx_refsource_REDHAT
- http://www.openwall.com/lists/oss-security/2011/06/27/1 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2011-2495 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=716825 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/1d1221f375c94ef961ba8574ac4f85c8870ddd51 x_refsource_CONFIRMExploitPatch
- https://nvd.nist.gov/vuln/detail/CVE-2011-2495
- https://www.cve.org/CVERecord?id=CVE-2011-2495
| Link | Providers | Tags |
|---|---|---|
| http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4 | x_refsource_CONFIRM | |
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1d1221f375c94ef961ba8574ac4f85c8870ddd51 | x_refsource_CONFIRM | |
| http://rhn.redhat.com/errata/RHSA-2011-1212.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.openwall.com/lists/oss-security/2011/06/27/1 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2011-2495 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=716825 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/torvalds/linux/commit/1d1221f375c94ef961ba8574ac4f85c8870ddd51 | x_refsource_CONFIRMExploitPatch | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-2495 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-2495 |
Change history (0)
No recorded changes yet.