high
7.8
CWE
416
Advisory Published
CVE Published
Updated

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 cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Novell Suse Linux Enterprise Desktop=12.0
Novell Suse Linux Enterprise Workstation Extension=12.0
Google Android=12.0
Novell Suse Linux Enterprise Server=11.0-sp4
Novell Opensuse Leap=42.1
Novell Suse Linux Enterprise Software Development Kit=11.0-sp4
Redhat Enterprise Linux=6.0
Canonical Ubuntu Linux=12.04
Linux Linux kernel>=2.6.30<3.2.80
Linux Linux kernel>=3.3<3.10.102
Linux Linux kernel>=3.11<3.12.59
Linux Linux kernel>=3.13<3.14.67
Linux Linux kernel>=3.15<3.16.35
Linux Linux kernel>=3.17<3.18.37
Linux Linux kernel>=3.19<4.1.28
Linux Linux kernel>=4.2<4.4.8
Linux Linux kernel>=4.5<4.5.2
Novell Suse Linux Enterprise Software Development Kit=12.0
Novell Suse Linux Enterprise Workstation Extension=12.0-sp1
Novell Suse Linux Enterprise Server=12.0
Novell Suse Linux Enterprise Desktop=12.0-sp1
Redhat Enterprise Linux=7.0
Oracle Linux=6
Novell Suse Linux Enterprise Real Time Extension=11.0-sp4
Novell Suse Linux Enterprise Server=12.0-sp1
Novell Suse Linux Enterprise Real Time Extension=12.0-sp1
Novell Suse Linux Enterprise Software Development Kit=12.0-sp1
Novell Suse Linux Enterprise Live Patching=12.0
Novell Suse Linux Enterprise Module For Public Cloud=12.0
debian/linux
5.10.223-1
5.10.226-1
6.1.106-3
6.1.112-1
6.11.4-1
6.11.5-1

Remedy

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89

Remedy

http://www.openwall.com/lists/oss-security/2016/05/15/2

Remedy

https://github.com/torvalds/linux/commit/1f461dcdd296eecedaffffc6bae2bfa90bd7eb89

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Reference Links

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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