Bug 1403145 (CVE-2016-9576)

Summary: CVE-2016-9576 kernel: Use after free in SCSI generic device interface
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: afox, aquini, arm-mgr, bhu, dhoward, fhrbata, gansalmon, hannsj_uhl, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kabbott, kbost, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, rt-maint, rvrbovsk, sardella, slawomir, vdronov, williams, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
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.
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:04:08 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1403146, 1414823, 1414834, 1414835, 1414836, 1414837    
Bug Blocks: 1403147    

Description Adam Mariš 2016-12-09 08:40:42 UTC
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 08:42:13 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1403146]

Comment 8 Vladis Dronov 2017-01-19 15:22:47 UTC
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 13:46:05 UTC
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 19:11:10 UTC
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 07:51:15 UTC
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 20:39:17 UTC
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