CVE-2016-9178: Infoleak
First published: Fri Nov 04 2016(Updated: )
An information leak was found in the Linux kernel. The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call. References: <a href="http://seclists.org/oss-sec/2016/q4/320">http://seclists.org/oss-sec/2016/q4/320</a> Upstream patch: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=4.7.4 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
- http://www.openwall.com/lists/oss-security/2016/11/04/4
- http://www.securityfocus.com/bid/94144
- https://bugzilla.redhat.com/show_bug.cgi?id=1391908
- https://github.com/torvalds/linux/commit/1c109fabbd51863475cd12ac206bdd249aee35af
- https://launchpad.net/bugs/cve/CVE-2016-9178
- http://seclists.org/oss-sec/2016/q4/320
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1391910
- https://access.redhat.com/support/policy/updates/errata/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9178
- https://nvd.nist.gov/vuln/detail/CVE-2016-9178
- https://security-tracker.debian.org/tracker/CVE-2016-9178
- https://ubuntu.com/security/CVE-2016-9178
- https://git.kernel.org/linus/1c109fabbd51863475cd12ac206bdd249aee35af
Frequently Asked Questions
What is the severity of CVE-2016-9178?
The severity of CVE-2016-9178 is low.
What is the affected software for CVE-2016-9178?
The affected software for CVE-2016-9178 includes Linux kernel versions before 4.7.5.
How can a local user exploit CVE-2016-9178?
A local user can exploit CVE-2016-9178 by triggering failure of a get_user_ex call to obtain sensitive information from kernel stack memory.
Are there any remedies available for CVE-2016-9178?
Yes, there are remedies available for CVE-2016-9178. It is recommended to upgrade to Linux kernel version 4.7.5 or higher.
Where can I find more information about CVE-2016-9178?
You can find more information about CVE-2016-9178 at the following references: http://www.openwall.com/lists/oss-security/2016/11/04/4, http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af, http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
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