Bug 1402013 - (CVE-2016-9793) CVE-2016-9793 kernel: Signed overflow for SO_{SND|RCV}BUFFORCE
CVE-2016-9793 kernel: Signed overflow for SO_{SND|RCV}BUFFORCE
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1412473 1412474 1412475 1412476 1412477 1402014
Blocks: 1402019
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Reported: 2016-12-06 10:07 EST by Adam Mariš
Modified: 2017-03-23 02:26 EDT (History)
38 users (show)

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Fixed In Version: kernel 4.9-rc8
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Description Adam Mariš 2016-12-06 10:07:40 EST
A flaw was found in the Linux kernels implementation of setsockopt for the SO_{SND|RCV}BUFFORCE setsockopt() system call.  Users with non-namespace CAP_NET_ADMIN are able to trigger this call and create a situation in which the sockets sendbuff data size could be negative.

This could adversely affect memory allocations and create situations where the system could crash or cause memory corruption.

This situation affects SO_SNDBUFF and SO_RCVBUFF similarly as shown in CVE-2012-6704.

Upstream patch:


CVE assignment:

Comment 1 Adam Mariš 2016-12-06 10:08:40 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1402014]
Comment 3 Wade Mealing 2017-01-12 01:05:16 EST

This issue does not affect the kernels as shipping with Red Hat Enterprise Linux 5 and 6.  This issue does affect kernels 7, MRG-2 and realtime kernels and plans to be fixed in a future update.

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