CVE-2011-2495

Severity: low (CVSS 2.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2012-06-13 · updated 2026-06-16
Weakness: CWE-264

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

Linux kernel: through 2.6.39.3; 2.6.39, 2.6.39-rc1, 2.6.39-rc2, 2.6.39-rc3, 2.6.39-rc4, 2.6.39-rc5 (+4)

References

http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1d1221f375c94ef961ba8574ac4f85c8870ddd51
http://rhn.redhat.com/errata/RHSA-2011-1212.html
http://www.openwall.com/lists/oss-security/2011/06/27/1
https://bugzilla.redhat.com/show_bug.cgi?id=716825
https://github.com/torvalds/linux/commit/1d1221f375c94ef961ba8574ac4f85c8870ddd51
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1d1221f375c94ef961ba8574ac4f85c8870ddd51
http://rhn.redhat.com/errata/RHSA-2011-1212.html
http://www.openwall.com/lists/oss-security/2011/06/27/1
https://bugzilla.redhat.com/show_bug.cgi?id=716825
https://github.com/torvalds/linux/commit/1d1221f375c94ef961ba8574ac4f85c8870ddd51

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