CVE-2016-2085
First published: Thu Apr 07 2016(Updated: )
A timing side channel vulnerability was discovered in the Linux Extended Verification Module (EVM). An attacker could use this to affect system integrity. The problem exists because the vm_verify_hmac() function includes a use of memcmp(). This function is not safe to be used for comparing memory, allows timing side channel attacks; specifically a MAC forgery complexity drop from 2^128 to 2^12. This patch changes the memcmp() to the cryptographically safe crypto_memneq(). Upstream fix: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=613317bd212c585c20796c10afe5daaa95d4b0a1">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=613317bd212c585c20796c10afe5daaa95d4b0a1</a> Original bug report: <a href="http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2085.html">http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2085.html</a>
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=4.4.8 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=613317bd212c585c20796c10afe5daaa95d4b0a1
- http://www.ubuntu.com/usn/USN-2946-1
- http://www.ubuntu.com/usn/USN-2946-2
- http://www.ubuntu.com/usn/USN-2947-1
- http://www.ubuntu.com/usn/USN-2947-2
- http://www.ubuntu.com/usn/USN-2947-3
- http://www.ubuntu.com/usn/USN-2948-1
- http://www.ubuntu.com/usn/USN-2948-2
- http://www.ubuntu.com/usn/USN-2949-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1324867
- https://github.com/torvalds/linux/commit/613317bd212c585c20796c10afe5daaa95d4b0a1
- https://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2085.html
- https://security-tracker.debian.org/tracker/CVE-2016-2085
- https://launchpad.net/bugs/cve/CVE-2016-2085
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=613317bd212c585c20796c10afe5daaa95d4b0a1
- http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2085.html
- https://git.kernel.org/linus/613317bd212c585c20796c10afe5daaa95d4b0a1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2085
- https://nvd.nist.gov/vuln/detail/CVE-2016-2085
- https://ubuntu.com/security/CVE-2016-2085
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2016-2085.
What is the severity of CVE-2016-2085?
The severity of CVE-2016-2085 is medium.
What is the affected software?
The affected software is Linux kernel versions before 4.5.
How does CVE-2016-2085 affect the Linux kernel?
CVE-2016-2085 makes it easier for local users to forge MAC values via a timing side-channel attack.
How can I fix CVE-2016-2085?
To fix CVE-2016-2085, update your Linux kernel to version 4.5 or later.
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