CVE-2015-8539
First published: Mon Nov 23 2015(Updated: )
A flaw was found in the Linux kernels key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there. Key management subsystems can abused to escalate privileges through memory corruption. Upstream: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd</a>
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-693.17.1.rt56.636.el7 | 0:3.10.0-693.17.1.rt56.636.el7 |
| redhat/kernel | <0:3.10.0-693.17.1.el7 | 0:3.10.0-693.17.1.el7 |
| redhat/kernel-rt | <1:3.10.0-693.17.1.rt56.604.el6 | 1:3.10.0-693.17.1.rt56.604.el6 |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Suse Linux Enterprise Real Time Extension | =12-sp1 | |
| Linux Linux kernel | <4.4 | |
| Linux Linux kernel | =4.4-rc1 | |
| Linux Linux kernel | =4.4-rc2 | |
| debian/linux | 5.10.223-1 6.1.106-3 6.1.99-1 6.10.9-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2015-8539 https://nvd.nist.gov/vuln/detail/CVE-2015-8539 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
- https://bugzilla.redhat.com/show_bug.cgi?id=1284450
- https://access.redhat.com/errata/RHSA-2018:0152
- https://access.redhat.com/errata/RHSA-2018:0151
- https://access.redhat.com/errata/RHSA-2018:0181
- https://access.redhat.com/security/cve/CVE-2015-8539
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00008.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00019.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00020.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00021.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00022.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- http://www.openwall.com/lists/oss-security/2015/12/09/1
- https://github.com/torvalds/linux/commit/096fe9eaea40a17e125569f9e657e34cdb6d73bd
- https://usn.ubuntu.com/3798-1/
- https://usn.ubuntu.com/3798-2/
- https://launchpad.net/bugs/cve/CVE-2015-8539
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
- http://seclists.org/oss-sec/2015/q4/465
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=146aa8b1453bd8f1ff2304ffb71b4ee0eb9acdcc
- https://www.openwall.com/lists/oss-security/2015/12/09/1
- https://security-tracker.debian.org/tracker/CVE-2015-8539
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8539
- https://nvd.nist.gov/vuln/detail/CVE-2015-8539
- https://ubuntu.com/security/CVE-2015-8539
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2015-8539?
CVE-2015-8539 is a vulnerability in the Linux kernel that allows local users to gain privileges or crash the machine.
How severe is CVE-2015-8539?
CVE-2015-8539 has a severity score of 7, which is considered high.
Which software versions are affected by CVE-2015-8539?
The Linux kernel versions before 4.4 are affected by CVE-2015-8539.
What is the remedy for CVE-2015-8539?
To fix CVE-2015-8539, update your Linux kernel to version 4.4~ or later.
Where can I find more information about CVE-2015-8539?
You can find more information about CVE-2015-8539 at the following references: [Link 1](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd), [Link 2](https://access.redhat.com/security/cve/CVE-2015-8539), [Link 3](http://seclists.org/oss-sec/2015/q4/465).
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