UpHeron
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Servers and applications

CVE-2016-6259

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.

Severity
Medium 6.2
Published
2 Aug 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.6% in the next 30 daysHigher than 51% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Needs local access · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • Version 4.7.0
  • Version 4.6.3
  • Version 4.6.1
  • Version 4.6.0
All 8 release lines
  • Version 4.5.0
  • Version 4.5.1
  • Version 4.5.2
  • Version 4.5.3
  • Version 4.6.0
  • Version 4.6.1
  • Version 4.6.3
  • Version 4.7.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-6259
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-6259