Bug 1074589 (CVE-2014-0131) - CVE-2014-0131 kernel: net: use-after-free during segmentation with zerocopy
Summary: CVE-2014-0131 kernel: net: use-after-free during segmentation with zerocopy
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2014-0131
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=low,public=20140310,reported=2...
Depends On: 1056934 1079004 1079005 1079006 1093342 1149133
Blocks: 1074601
TreeView+ depends on / blocked
 
Reported: 2014-03-10 15:26 UTC by Petr Matousek
Modified: 2019-06-08 19:57 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-12-10 09:44:42 UTC


Attachments (Terms of Use)

Description Petr Matousek 2014-03-10 15:26:31 UTC
An information leak flaw was found in the way way segmentation was performed on skbs originated from vhost-net when zerocopy feature was enabled. Once the source skb is consumed, ubuf destructor is called and potentially releases the corresponding userspace buffers, which can then for example be repurposed, while the destination skb could still be pointing to the them.

Acknowledgements:

This issue was discovered by Michael S. Tsirkin of Red Hat.

Comment 1 Petr Matousek 2014-03-10 16:35:05 UTC
Upstream patch submission:

http://marc.info/?l=linux-netdev&m=139446896921968&w=2

Comment 3 Petr Matousek 2014-03-20 17:58:18 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1079006]

Comment 4 Petr Matousek 2014-03-20 17:58:45 UTC
Statement:

This issue does not affect Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

This issue affects the Linux kernel package as shipped with Red Hat Enterprise Linux 6. 

Red Hat Product Security has rated this issue as having Low security impact. The risks and engineering effort associated with fixing this bug are greater
than its security impact. This issue is not currently planned to be addressed
in future kernel updates for Red Hat Enterprise Linux 6. For additional
information, refer to the Issue Severity Classification: 
https://access.redhat.com/security/updates/classification/.

Comment 5 Fedora Update System 2014-03-28 03:15:55 UTC
kernel-3.13.7-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-03-28 03:17:54 UTC
kernel-3.13.7-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.


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