xen: x86: Missing SMAP whitelisting in 32-bit exception / event delivery (XSA-183)
Published Aug 2, 2016
6.3
MEDIUMCVSS 3.0
EPSS 0.64%
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.
Affected products
No data.
Configuration 1
No data.
Red Hat Enterprise Linux 5
xen
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | xen | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
AV:L/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.64% (0.00639) | 48.71th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.64% (0.00639) | 45.63th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.05% (0.00054) | 14.22th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.18% (0.00181) | 56.61th | v3 (v2023.03.01) |
| Jun 21, 2024 | 0.18% (0.00181) | 55.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00181) | 53.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
References (10)
- http://support.citrix.com/article/CTX214954 x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/92130 vdb-entryx_refsource_BIDThird Party Advisory
- http://www.securitytracker.com/id/1036447 vdb-entryx_refsource_SECTRACKThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-183.html x_refsource_CONFIRMMailing ListPatch
- http://xenbits.xen.org/xsa/xsa183-4.6.patch x_refsource_CONFIRMMitigationPatch
- http://xenbits.xen.org/xsa/xsa183-unstable.patch x_refsource_CONFIRMMitigationPatch
- https://access.redhat.com/security/cve/CVE-2016-6259 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1355983 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-6259
- https://www.cve.org/CVERecord?id=CVE-2016-6259
| Link | Providers | Tags |
|---|---|---|
| http://support.citrix.com/article/CTX214954 | x_refsource_CONFIRMVendor Advisory | |
| http://www.securityfocus.com/bid/92130 | vdb-entryx_refsource_BIDThird Party Advisory | |
| http://www.securitytracker.com/id/1036447 | vdb-entryx_refsource_SECTRACKThird Party Advisory | |
| http://xenbits.xen.org/xsa/advisory-183.html | x_refsource_CONFIRMMailing ListPatch | |
| http://xenbits.xen.org/xsa/xsa183-4.6.patch | x_refsource_CONFIRMMitigationPatch | |
| http://xenbits.xen.org/xsa/xsa183-unstable.patch | x_refsource_CONFIRMMitigationPatch | |
| https://access.redhat.com/security/cve/CVE-2016-6259 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1355983 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-6259 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-6259 |
Change history (0)
No recorded changes yet.