CVE-2015-0239

Public Exploit

Description

The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (guest OS crash) by triggering use of a 16-bit code segment for emulation of a SYSENTER instruction.

Category

4.4
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.11%
Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory mandriva.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory kernel.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.ubuntu.com/usn/USN-2515-1 third party advisory vendor advisory
http://www.debian.org/security/2015/dsa-3170 third party advisory vendor advisory
http://www.securityfocus.com/bid/72842 vdb entry third party advisory
http://www.openwall.com/lists/oss-security/2015/01/27/6 mailing list exploit third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1186448 issue tracking third party advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f3747379accba8e95d70cec0eae0582c8c182050
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html third party advisory
https://github.com/torvalds/linux/commit/f3747379accba8e95d70cec0eae0582c8c182050 third party advisory patch
http://www.ubuntu.com/usn/USN-2514-1 third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-2518-1 third party advisory vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html third party advisory
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5 release notes vendor advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2015:058 third party advisory vendor advisory
http://permalink.gmane.org/gmane.linux.kernel.commits.head/502245 mailing list broken link
http://www.ubuntu.com/usn/USN-2517-1 third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-2516-1 third party advisory vendor advisory
http://rhn.redhat.com/errata/RHSA-2015-1272.html third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-2513-1 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2015-0239?
CVE-2015-0239 has been scored as a medium severity vulnerability.
How to fix CVE-2015-0239?
To fix CVE-2015-0239, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-0239 being actively exploited in the wild?
It is possible that CVE-2015-0239 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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