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Bug 1403145 - (CVE-2016-9576) CVE-2016-9576 kernel: Use after free in SCSI generic device interface
CVE-2016-9576 kernel: Use after free in SCSI generic device interface
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=20161125,repor...
: Security
Depends On: 1414836 1403146 1414823 1414834 1414835 1414837
Blocks: 1403147
  Show dependency tree / graph
 
Reported: 2016-12-09 03:40 EST by Adam Mariš
Modified: 2018-08-28 18:11 EDT (History)
39 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the blk_rq_map_user_iov() function in the Linux kernel's block device implementation did not properly restrict the type of iterator, which could allow 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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RHEL 7.3 requirements from Atomic Host:
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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 Adam Mariš 2016-12-09 03:40:42 EST 
Use-after-free vulnerability in SCSI generic device interface has been reported which allows kernel memory read/write when having access to /dev/sg* SCSI generic devices. This issue affects versions of Linux down to 2.6. This was assigned CVE-2016-9576.

Initial message:

https://www.spinics.net/lists/linux-scsi/msg102232.html

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a0ac402cfcdc904f9772e1762b3fda112dcc56a0

Oss-security post:

http://seclists.org/oss-sec/2016/q4/644

Later an additional fix was developed, it was assigned CVE-2016-10088, see:

https://bugzilla.redhat.com/show_bug.cgi?id=1412210
Comment 1 Adam Mariš 2016-12-09 03:42:13 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1403146]
Comment 8 Vladis Dronov 2017-01-19 10:22:47 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 11 errata-xmlrpc 2017-03-21 09:46:05 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 13 errata-xmlrpc 2017-08-01 15:11:10 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 14 errata-xmlrpc 2017-08-02 03:51:15 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 15 errata-xmlrpc 2017-09-06 16:39:17 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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