Bug 1303532 - (CVE-2015-8812) CVE-2015-8812 kernel: CXGB3: Logic bug in return code handling prematurely frees key structures causing Use after free or kernel panic.
CVE-2015-8812 kernel: CXGB3: Logic bug in return code handling prematurely fr...
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=20160211,repor...
: Security
Depends On: 1309548
Blocks: 1247078 1247626
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Reported: 2016-02-01 03:32 EST by Wade Mealing
Modified: 2016-11-03 17:47 EDT (History)
14 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A use-after-free flaw was found in the CXGB3 kernel driver when the network was considered to be congested. The kernel incorrectly misinterpreted the congestion as an error condition and incorrectly freed or cleaned up the socket buffer (skb). When the device then sent the skb's queued data, these structures were referenced. A local attacker could use this flaw to panic the system (denial of service) or, with a local account, escalate their privileges.
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Description Wade Mealing 2016-02-01 03:32:11 EST
A flaw was found in the CXGB3 kernel driver when the network was considered congested.  The kernel would incorrectly misinterpret the congestion as an error condition and incorrectly free/clean up the skb. When the device would then send the skb's queued, these structures would be referenced and may panic the system or allow an attacker to escalate privileges in a use-after-free scenario.

From the patch: 

----

The cxgb3_*_send() functions return NET_XMIT_ values, which are
positive integers values. So don't treat positive return values
as an error.
----


Upstream commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=67f1aee6f45059fd6b0f5b0ecb2c97ad0451f6b3

CVE assignment:
http://seclists.org/oss-sec/2016/q1/311
Comment 1 Wade Mealing 2016-02-05 04:23:25 EST
Statement: 

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6 and 7 and Red Hat Enterprise MRG 2 and realtime kernels and may be addressed in a future update.

This has been rated as having Moderate security impact and is not currently
planned to be addressed in future updates in Red Hat Enterprise Linux 5 and 6 . For additional information, refer to the Red Hat Enterprise Linux Life Cycle:
https://access.redhat.com/support/policy/updates/errata/.
Comment 2 Wade Mealing 2016-02-11 04:41:05 EST
Acknowledgements:

Name: Venkatesh Pottem (Red Hat Engineering)
Comment 4 Wade Mealing 2016-02-18 00:37:48 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1309548]
Comment 5 Fedora Update System 2016-02-28 03:20:49 EST
kernel-4.3.6-201.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2016-02-28 07:20:59 EST
kernel-4.4.2-301.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2016-03-04 20:19:45 EST
kernel-4.4.3-201.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 errata-xmlrpc 2016-11-03 11:15:21 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
Comment 9 errata-xmlrpc 2016-11-03 15:41:05 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html
Comment 10 errata-xmlrpc 2016-11-03 17:31:56 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
Comment 11 errata-xmlrpc 2016-11-03 17:47:24 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html

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