Bug 722557 - (CVE-2011-2695) CVE-2011-2695 kernel: ext4: kernel panic when writing data to the last block of sparse file
CVE-2011-2695 kernel: ext4: kernel panic when writing data to the last block ...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
public=20110603,reported=20110715,sou...
: Security
Depends On: 722562 722563 722564 722568 722569
Blocks:
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Reported: 2011-07-15 12:20 EDT by Petr Matousek
Modified: 2015-08-19 05:11 EDT (History)
17 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-07-29 08:49:01 EDT
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Description Petr Matousek 2011-07-15 12:20:18 EDT
If an extent exists which includes the block right before the maximum file offset, and the block for the maximum file offset is written, the kernel panics. For 4KB block size, the problem only occurs on x86_64 architecture. For 1KB or 2KB block size, the problem occurs on both i386 and x86_64.

Local unprivileged users can use this flaw to crash the system when ext4 filesystem is in use.

Upstream fix:
http://git.kernel.org/linus/f17722f917b2f21497deb6edc62fb1683daa08e6

References:
http://www.spinics.net/lists/linux-ext4/msg25697.html
Comment 4 Petr Matousek 2011-07-15 12:52:58 EDT
Statement:

This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1386.html,  https://rhn.redhat.com/errata/RHSA-2011-1189.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 as it did not include support for EXT4 filesystem.
Comment 6 errata-xmlrpc 2011-08-23 10:42:11 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:1189 https://rhn.redhat.com/errata/RHSA-2011-1189.html
Comment 7 errata-xmlrpc 2011-09-12 15:44:44 EDT
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2011:1253 https://rhn.redhat.com/errata/RHSA-2011-1253.html
Comment 8 errata-xmlrpc 2011-10-20 13:28:23 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1386 https://rhn.redhat.com/errata/RHSA-2011-1386.html
Comment 9 Eugene Teo (Security Response) 2012-04-09 20:59:53 EDT
This issue has been addressed in rhel-6.1.z via RHSA-2011:1189 https://rhn.redhat.com/errata/RHSA-2011-1189.html

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