CVE-2016-4558: Use After Free
First published: Mon May 09 2016(Updated: )
A flaw was found in the Linux kernels implementation of BPF in which systems with more than 32GB of physical memory and unlimited RLIMIT_MEMLOCK settings an application can overflow a 32 bit refcount. Additionally in the same environment, malicious applications can overflow a map refcount on larger memory (1Tb). When the overflow wraps to zero a reference can be held while being free'd. This can lead to a use after free CVE assignment: <a href="http://seclists.org/oss-sec/2016/q2/266">http://seclists.org/oss-sec/2016/q2/266</a> Upstream fix: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=4.4<4.4.11 | |
| Linux kernel | >=4.5<4.5.5 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Linux Kernel | >=4.4<4.4.11 | |
| Linux Kernel | >=4.5<4.5.5 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5
- http://www.openwall.com/lists/oss-security/2016/05/06/4
- http://www.ubuntu.com/usn/USN-3005-1
- http://www.ubuntu.com/usn/USN-3006-1
- http://www.ubuntu.com/usn/USN-3007-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1334303
- https://github.com/torvalds/linux/commit/92117d8443bc5afacc8d5ba82e541946310f106e
- https://launchpad.net/bugs/cve/CVE-2016-4558
- http://seclists.org/oss-sec/2016/q2/266
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1334311
- https://git.kernel.org/linus/92117d8443bc5afacc8d5ba82e541946310f106e
- https://git.kernel.org/linus/1be7f75d1668d6296b80bf35dcf6762393530afc(v4.4-rc1)
- https://bugs.chromium.org/p/project-zero/issues/detail?id=809
- https://security-tracker.debian.org/tracker/CVE-2016-4558
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4558
- https://nvd.nist.gov/vuln/detail/CVE-2016-4558
- https://ubuntu.com/security/CVE-2016-4558
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID is CVE-2016-4558.
What is the severity level of CVE-2016-4558?
The severity level of CVE-2016-4558 is high.
How does CVE-2016-4558 affect Linux systems?
CVE-2016-4558 can cause a denial of service (use-after-free) or possibly have unspecified other impact via a crafted application on systems with more than 32 Gb of memory.
Which versions of the Linux kernel are affected by CVE-2016-4558?
Linux kernel versions before 4.5.5 are affected by CVE-2016-4558.
How can I fix CVE-2016-4558?
To fix CVE-2016-4558, update your Linux kernel to version 4.5.5 or later.
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