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CVE-2015-0239

4.4 · MEDIUM

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…

Published Mar 2, 2015linuxCWE-269EPSS 0.64%

Overview

CVE-2015-0239 is a medium-severity vulnerability affecting linux linux_kernel. It was published on March 2, 2015 and has a CVSS 2.0 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel>= 0, < 3.18.5Affected

References

Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f3747379accba8e95d70cec0eae0582c8c182050Refpermalink.gmane.org/gmane.linux.kernel.commits.head/502245Refrhn.redhat.com/errata/RHSA-2015-1272.htmlRefwww.debian.org/security/2015/dsa-3170Refwww.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5Refwww.mandriva.com/security/advisories?name=MDVSA-2015:058Refwww.openwall.com/lists/oss-security/2015/01/27/6Refwww.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.htmlRefwww.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.htmlRefwww.securityfocus.com/bid/72842

How CyberStrike helps

Frequently asked questions

What is CVE-2015-0239?

CVE-2015-0239 is a medium-severity vulnerability affecting linux linux_kernel. It was published on March 2, 2015 and has a CVSS 2.0 base score of 4.4 (MEDIUM).

How severe is CVE-2015-0239?

This vulnerability has a CVSS 2.0 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-0239?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-0239?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-0239 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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