CVE-2016-9382
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.45% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-264
- Affected
- xen/xen · citrix/xenserver
- Source
- cve@mitre.org
References
- http://www.securityfocus.com/bid/94470Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037341Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-192.htmlPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX218775Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94470Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037341Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-192.htmlPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX218775Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.