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Bug 1193907 - (CVE-2015-0275) CVE-2015-0275 kernel: fs: ext4: fallocate zero range page size > block size BUG()
CVE-2015-0275 kernel: fs: ext4: fallocate zero range page size > block size B...
Status: NEW
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
impact=moderate,public=20150218,repor...
: Security
Depends On: 1187071 1193909 1195178 1252878 1252880 1252881
Blocks: 1193911
  Show dependency tree / graph
 
Reported: 2015-02-18 09:33 EST by Petr Matousek
Modified: 2018-08-28 17:57 EDT (History)
20 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way the Linux kernel's ext4 file system handled the "page size > block size" condition when the fallocate zero range functionality was used. A local attacker could use this flaw to crash the system.
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Last Closed:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:1778 normal SHIPPED_LIVE Important: kernel security and bug fix update 2015-09-15 12:03:32 EDT
Red Hat Product Errata RHSA-2015:1787 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2015-09-15 09:22:07 EDT
Red Hat Product Errata RHSA-2015:1788 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2015-09-15 09:38:06 EDT

  None (edit)
Description Petr Matousek 2015-02-18 09:33:53 EST 
A flaw was found in the way the Linux kernel's EXT4 filesystem handled
page size > block size condition when fallocate zero range functionality
is used.

Acknowledgements:

This issue was discovered by Xiong Zhou of Red Hat.
Comment 2 Petr Matousek 2015-02-23 04:48:06 EST 
Upstream patch submission:

http://www.spinics.net/lists/linux-ext4/msg47193.html
Comment 3 Petr Matousek 2015-02-23 04:58:48 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6. This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future updates in the respective releases may address this issue.
Comment 4 Petr Matousek 2015-02-23 05:36:24 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1195178]
Comment 5 Fedora Update System 2015-03-09 04:17:17 EDT 
kernel-3.18.8-201.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2015-03-14 05:15:26 EDT 
kernel-3.18.9-100.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 errata-xmlrpc 2015-09-15 05:23:39 EDT 
This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1787 https://rhn.redhat.com/errata/RHSA-2015-1787.html
Comment 10 errata-xmlrpc 2015-09-15 05:39:26 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1788 https://rhn.redhat.com/errata/RHSA-2015-1788.html
Comment 11 errata-xmlrpc 2015-09-15 08:06:47 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1778 https://rhn.redhat.com/errata/RHSA-2015-1778.html
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