CVE-2016-4805: Use After Free
First published: Fri May 13 2016(Updated: )
A use after free vulnerability was found in ppp_unregister_channel function. This is triggered when network namespace is removed while ppp_async channel is still registered in it and ppp_unregister_channel() tries to access its per-netns data in the defunct namespace. An attacker who could control this memory that is being used in the defunct namespace could create a denial of service by spinlocking a CPU. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. Upstream patch: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89</a> CVE request: <a href="http://seclists.org/oss-sec/2016/q2/319">http://seclists.org/oss-sec/2016/q2/319</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| SUSE Linux Enterprise Desktop | =12.0 | |
| SUSE Linux Enterprise Workstation Extension | =12.0 | |
| SUSE Linux Enterprise Module for Public Cloud | =12.0 | |
| SUSE Linux Enterprise Server | =11.0-sp4 | |
| openSUSE Leap | =42.1 | |
| SUSE Linux Enterprise Software Development Kit | =11.0-sp4 | |
| Red Hat Enterprise Linux | =6.0 | |
| Ubuntu | =12.04 | |
| Linux Kernel | >=2.6.30<3.2.80 | |
| Linux Kernel | >=3.3<3.10.102 | |
| Linux Kernel | >=3.11<3.12.59 | |
| Linux Kernel | >=3.13<3.14.67 | |
| Linux Kernel | >=3.15<3.16.35 | |
| Linux Kernel | >=3.17<3.18.37 | |
| Linux Kernel | >=3.19<4.1.28 | |
| Linux Kernel | >=4.2<4.4.8 | |
| Linux Kernel | >=4.5<4.5.2 | |
| SUSE Linux Enterprise Software Development Kit | =12.0 | |
| SUSE Linux Enterprise Workstation Extension | =12.0-sp1 | |
| SUSE Linux Enterprise Server | =12.0 | |
| SUSE Linux Enterprise Desktop | =12.0-sp1 | |
| Red Hat Enterprise Linux | =7.0 | |
| Oracle Linux | =6 | |
| SUSE Linux Enterprise Real Time Extension | =11.0-sp4 | |
| SUSE Linux Enterprise Server | =12.0-sp1 | |
| SUSE Linux Enterprise Real Time Extension | =12.0-sp1 | |
| SUSE Linux Enterprise Software Development Kit | =12.0-sp1 | |
| SUSE Linux Enterprise Live Patching | =12.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2016/05/15/2
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.2
- https://bugzilla.redhat.com/show_bug.cgi?id=1335803
- https://github.com/torvalds/linux/commit/1f461dcdd296eecedaffffc6bae2bfa90bd7eb89
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00052.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html
- http://www.ubuntu.com/usn/USN-3021-1
- http://www.ubuntu.com/usn/USN-3021-2
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
- http://www.debian.org/security/2016/dsa-3607
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
- http://www.securityfocus.com/bid/90605
- http://www.securitytracker.com/id/1036763
- https://launchpad.net/bugs/cve/CVE-2016-4805
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89
- http://seclists.org/oss-sec/2016/q2/319
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1335804
- http://seclists.org/oss-sec/2016/q2/346
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=273ec51dd7ceaa76e038875d85061ec856d8905e
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4805
- https://nvd.nist.gov/vuln/detail/CVE-2016-4805
- https://security-tracker.debian.org/tracker/CVE-2016-4805
- https://ubuntu.com/security/CVE-2016-4805
- https://git.kernel.org/linus/1f461dcdd296eecedaffffc6bae2bfa90bd7eb89
- https://git.kernel.org/linus/273ec51dd7ceaa76e038875d85061ec856d8905e
Frequently Asked Questions
What is the vulnerability ID for this use-after-free vulnerability?
CVE-2016-4805
What is the severity level of CVE-2016-4805?
The severity level of CVE-2016-4805 is low.
How can the use-after-free vulnerability in Linux kernel before 4.5.2 impact my system?
The use-after-free vulnerability can cause a denial of service (memory corruption and system crash) or possibly have other unspecified impacts.
Is there a fix available for CVE-2016-4805?
Yes, upgrading to Linux kernel version 4.5.2 or later can fix the vulnerability.
Where can I find more information about CVE-2016-4805?
You can find more information about CVE-2016-4805 in the references: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89, http://seclists.org/oss-sec/2016/q2/319, https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1335804.
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