CVE-2016-9382

7.8 highEPSS 0.4%

Xen 4.0.x through 4.7.x mishandle x86 task switches to VM86 mode, which allows local 32-bit x86 HVM guest OS users to gain privileges or cause a denial of service (guest OS crash) by leveraging a guest operating system that uses hardware task switching and allows a new task to start in VM86 mode.

Severity

CVSS 3.0

7.8 high

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE: CWE-264
Published: 2017-01-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

citrix:xenserver
xen:xen

References

http://www.securityfocus.com/bid/94470
http://www.securitytracker.com/id/1037341
http://xenbits.xen.org/xsa/advisory-192.html
https://security.gentoo.org/glsa/201612-56
https://support.citrix.com/article/CTX218775

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