Bug 1070618 (CVE-2014-0100) - CVE-2014-0100 kernel: net: inet frag code race condition leading to user-after-free
Summary: CVE-2014-0100 kernel: net: inet frag code race condition leading to user-afte...
Keywords:
Status: ASSIGNED
Alias: CVE-2014-0100
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1070620 1070711 1072026
Blocks: 1070640
TreeView+ depends on / blocked
 
Reported: 2014-02-27 09:22 UTC by Petr Matousek
Modified: 2019-09-29 13:13 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-02-27 09:27:32 UTC


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System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0557 normal SHIPPED_LIVE Important: kernel-rt security update 2014-05-27 20:25:52 UTC

Description Petr Matousek 2014-02-27 09:22:49 UTC
Description of the problem:

A very subtle race condition between inet_frag_evictor,
inet_frag_intern and the IPv4/6 frag_queue and expire functions (basically
the users of inet_frag_kill/inet_frag_put) was found.

What happens is that after a fragment has been added to the hash chain but
before it's been added to the lru_list (inet_frag_lru_add), it may get
deleted (either by an expired timer if the system load is high or the
timer sufficiently low, or by the fraq_queue function for different
reasons) before it's added to the lru_list, then after it gets added
it's a matter of time for the evictor to get to a piece of memory which
has been freed leading to a number of different bugs depending on what's
left there.

Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ef0eb0d

Acknowledgements:

This issue was discovered by Nikolay Aleksandrov of Red Hat.

Comment 1 Petr Matousek 2014-02-27 09:27:32 UTC
Statement:

This issue did not affect the versions of Linux kernel package as shipped with Red Hat Enterprise Linux 5 and 6 as they did not backport the commit that introduced this issue.

Comment 5 Petr Matousek 2014-03-03 17:03:50 UTC
Upstream patch submission:

http://patchwork.ozlabs.org/patch/325844/

Comment 6 Petr Matousek 2014-03-03 17:30:42 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1072026]

Comment 7 Fedora Update System 2014-03-06 08:09:56 UTC
kernel-3.13.5-202.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2014-03-09 04:38:38 UTC
kernel-3.13.5-103.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 errata-xmlrpc 2014-05-27 16:27:21 UTC
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0557 https://rhn.redhat.com/errata/RHSA-2014-0557.html


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