Bug 1332931 (CVE-2016-4482) - CVE-2016-4482 kernel: information leak in devio.c
Summary: CVE-2016-4482 kernel: information leak in devio.c
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2016-4482
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1332932 1341209 1341211 1341212 1341213
Blocks: 1332934
TreeView+ depends on / blocked
 
Reported: 2016-05-04 11:47 UTC by Andrej Nemec
Modified: 2021-02-17 03:55 UTC (History)
34 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The proc_connectinfo() function in 'drivers/usb/core/devio.c' in the Linux kernel through 4.6 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory via a crafted USBDEVFS_CONNECTINFO ioctl call. The stack object 'ci' has a total size of 8 bytes. Its last 3 bytes are padding bytes which are not initialized and are leaked to userland.
Clone Of:
Environment:
Last Closed: 2016-06-01 15:12:21 UTC
Embargoed:

Attachments (Terms of Use)

Description Andrej Nemec 2016-05-04 11:47:04 UTC 
The proc_connectinfo() function in 'drivers/usb/core/devio.c' in the Linux kernel through 4.6 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory via a crafted USBDEVFS_CONNECTINFO ioctl call. The stack object 'ci' has a total size of 8 bytes. Its last 3 bytes are padding bytes which are not initialized and are leaked to userland.

External references:

http://www.spinics.net/lists/linux-usb/msg140243.html

CVE-ID request and assignment:

http://seclists.org/oss-sec/2016/q2/209

http://seclists.org/oss-sec/2016/q2/213

Upstream fix:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=681fef8380eb818c0b845fca5d2ab1dcbab114ee
Comment 1 Andrej Nemec 2016-05-04 11:49:02 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1332932]
Comment 2 Fedora Update System 2016-05-08 10:28:57 UTC 
kernel-4.5.3-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 3 Fedora Update System 2016-05-12 07:29:33 UTC 
kernel-4.4.9-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2016-05-16 14:53:33 UTC 
kernel-4.4.9-200.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 Vladis Dronov 2016-05-31 10:33:09 UTC 
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
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