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Bug 1412210 - (CVE-2016-10088) CVE-2016-10088 kernel: Use after free in SCSI generic device interface (CVE-2016-9576 regression)
CVE-2016-10088 kernel: Use after free in SCSI generic device interface (CVE-2...
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=20170111,repor...
: Reopened, Security
Depends On: 1414836 1403146 1414823 1414834 1414835 1414837
Blocks: 1403147
  Show dependency tree / graph
 
Reported: 2017-01-11 09:22 EST by Andrej Nemec
Modified: 2018-08-28 18:12 EDT (History)
32 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the fix for CVE-2016-9576 was incomplete: the Linux kernel's sg implementation did not properly restrict write operations in situations where the KERNEL_DS option is set. A local attacker to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging write access to a /dev/sg device.
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Clone Of:
Environment:
Last Closed: 2017-01-11 09:24:55 EST
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Regression: ---
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CRM:
Verified Versions:
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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 RHEA-2017:3163 normal SHIPPED_LIVE new packages: kernel-alt 2017-11-09 09:59:25 EST
Red Hat Product Errata RHSA-2017:0817 normal SHIPPED_LIVE Moderate: kernel security, bug fix, and enhancement update 2017-03-21 09:06:51 EDT
Red Hat Product Errata RHSA-2017:1842 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 14:22:09 EDT
Red Hat Product Errata RHSA-2017:2077 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 14:13:37 EDT
Red Hat Product Errata RHSA-2017:2669 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-09-06 20:36:52 EDT

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Description Andrej Nemec 2017-01-11 09:22:30 EST 
The sg implementation in the Linux kernel through 4.9 does not properly restrict write operations in situations where the KERNEL_DS option is set, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device, related to block/bsg.c and drivers/scsi/sg.c. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-9576.

References:

http://seclists.org/oss-sec/2016/q4/779

Upstream patch:

https://git.kernel.org/linus/128394eff343fc6d2f32172f03e24829539c5835

This is an additional fix for CVE-2016-9576, see:

https://bugzilla.redhat.com/show_bug.cgi?id=1403145
Comment 7 Vladis Dronov 2017-01-19 10:22:50 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code which can trigger the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
Comment 10 errata-xmlrpc 2017-03-21 09:24:06 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0817 https://rhn.redhat.com/errata/RHSA-2017-0817.html
Comment 12 errata-xmlrpc 2017-08-01 15:12:06 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 13 errata-xmlrpc 2017-08-02 03:52:11 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 14 errata-xmlrpc 2017-09-06 16:39:37 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669
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