CVE-2014-7155

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2014-10-02 · updated 2026-06-17
Weakness: CWE-264

Description

The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service (guest crash) or gain guest kernel mode privileges via vectors involving an (1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.

Affected products

Debian Linux: 7.0
Fedoraproject Fedora: 19, 20
Opensuse: 12.3, 13.1
xen: through 4.4.0; 3.0.2, 3.0.3, 3.0.4, 3.1.3, 3.1.4, 3.2.0 (+31)

References

http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140418.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140483.html
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html
http://secunia.com/advisories/61858
http://secunia.com/advisories/61890
http://security.gentoo.org/glsa/glsa-201412-42.xml
http://support.citrix.com/article/CTX200218
http://www.debian.org/security/2014/dsa-3041
http://www.securityfocus.com/bid/70057
http://www.securitytracker.com/id/1030888
http://xenbits.xen.org/xsa/advisory-105.html

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