kernel: xen: hypercall set_debugreg vulnerability
Published Nov 23, 2012
2.1
LOWCVSS 2.0
EPSS 0.44%
Description
The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
kernel-xen
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-xen | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5. This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:N/I:N/A:P
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 | 0.44% (0.00437) | 35.64th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.44% (0.00437) | 34.60th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00111) | 27.05th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00064) | 30.08th | v3 (v2023.03.01) |
| Jun 21, 2024 | 0.06% (0.00064) | 28.17th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00064) | 26.16th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
References (28)
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00005.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html vendor-advisoryx_refsource_SUSE
- http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html mailing-listx_refsource_MLIST
- http://osvdb.org/85197 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/50472 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/50530 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/51413 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/55082 third-party-advisoryx_refsource_SECUNIA
- http://security.gentoo.org/glsa/glsa-201309-24.xml vendor-advisoryx_refsource_GENTOO
- http://support.citrix.com/article/CTX134708 x_refsource_CONFIRMPatchVendor Advisory
- http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability x_refsource_MISC
- http://www.debian.org/security/2012/dsa-2544 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2012/09/05/5 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/55400 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1027479 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2012-3494 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=851139 x_refsource_MISCIssue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/78265 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2012-3494
- https://security.gentoo.org/glsa/201604-03 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2012-3494
Change history (0)
No recorded changes yet.