CVE-2016-6259
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2016-6259
Vendor advisory: cve@mitre.org — http://xenbits.xen.org/xsa/xsa183-unstable.patch
Vendor advisory: cve@mitre.org — http://xenbits.xen.org/xsa/xsa183-4.6.patch
Vendor advisory: cve@mitre.org — http://xenbits.xen.org/xsa/advisory-183.html
Vendor advisory: cve@mitre.org — http://support.citrix.com/article/CTX214954
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 4.8.0~rc3-1 |
| debian | bullseye | fixed | 4.8.0~rc3-1 |
| debian | forky | fixed | 4.8.0~rc3-1 |
| debian | sid | fixed | 4.8.0~rc3-1 |
| debian | trixie | fixed | 4.8.0~rc3-1 |
References
- http://support.citrix.com/article/CTX214954
- http://www.securityfocus.com/bid/92130
- http://www.securitytracker.com/id/1036447
- http://xenbits.xen.org/xsa/advisory-183.html
- http://xenbits.xen.org/xsa/xsa183-4.6.patch
- http://xenbits.xen.org/xsa/xsa183-unstable.patch
- https://security-tracker.debian.org/tracker/CVE-2016-6259
CWEs
CWE-20
Verify integrity in audit chain (admin only). AS-IS.