Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 3.18.5 |
| Canonical | Ubuntu Linux | 12.04 |
| Debian | Debian Linux | 7.0 |
| Oracle | Linux | 5 |
| Redhat | Enterprise Linux Desktop | 6.0 |
| Redhat | Enterprise Linux Server | 6.0 |
| Redhat | Enterprise Linux Workstation | 6.0 |
Related Weaknesses (CWE)
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=
- http://permalink.gmane.org/gmane.linux.kernel.commits.head/502245Broken Link
- http://rhn.redhat.com/errata/RHSA-2015-1272.htmlThird Party Advisory
- http://www.debian.org/security/2015/dsa-3170Third Party Advisory
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5Release NotesVendor Advisory
- http://www.mandriva.com/security/advisories?name=MDVSA-2015:058Third Party Advisory
- http://www.openwall.com/lists/oss-security/2015/01/27/6ExploitMailing ListThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.hThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.hThird Party Advisory
- http://www.securityfocus.com/bid/72842Third Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2513-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2514-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2515-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2516-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2517-1Third Party Advisory
FAQ
What is CVE-2015-0239?
CVE-2015-0239 is a vulnerability with a CVSS score of 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 a ...
How severe is CVE-2015-0239?
CVE-2015-0239 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2015-0239?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux, Debian Debian Linux, Oracle Linux, Redhat Enterprise Linux Desktop.