xen: stale P2M mappings due to insufficient error checking (XSA-222)
Published Jul 5, 2017
10.0
CRITICALCVSS 3.0
EPSS 3.67%
Description
Xen through 4.8.x does not validate memory allocations during certain P2M operations, which allows guest OS users to obtain privileged host OS access, aka XSA-222.
Affected products
Remediation
Red Hat mitigation
On x86, specifying "hap_1gb=0 hap_2mb=0" on the hypervisor command line will avoid the vulnerability. Alternatively, running all x86 HVM guests in shadow mode will also avoid this vulnerability. (For example, by specifying "hap=0" in the xl domain configuration file.) There is no known mitigation on ARM systems.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:C/I:C/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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.67% (0.03670) | 89.30th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.67% (0.03670) | 88.18th | v5 (v2026.06.15) |
| Jun 19, 2025 | 1.67% (0.01672) | 81.28th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.06% (0.04059) | 87.45th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.20% (0.06199) | 84.35th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.06% (0.04059) | 87.77th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.93% (0.00934) | 83.22th | v3 (v2023.03.01) |
| Mar 8, 2024 | 0.93% (0.00934) | 82.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.93% (0.00934) | 80.62th | 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) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v1 |
| Jan 6, 2022 | 1.45% (0.01454) | 31.96th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (11)
- http://www.debian.org/security/2017/dsa-3969 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/99161 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038732 vdb-entryx_refsource_SECTRACK
- http://xenbits.xen.org/xsa/advisory-222.html
- https://access.redhat.com/security/cve/CVE-2017-10918 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1458876 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-10918
- https://security.gentoo.org/glsa/201708-03 vendor-advisoryx_refsource_GENTOO
- https://security.gentoo.org/glsa/201710-17 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2017-10918
- https://xenbits.xen.org/xsa/advisory-222.html x_refsource_CONFIRMMailing ListMitigationThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3969 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securityfocus.com/bid/99161 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1038732 | vdb-entryx_refsource_SECTRACK | |
| http://xenbits.xen.org/xsa/advisory-222.html | ||
| https://access.redhat.com/security/cve/CVE-2017-10918 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1458876 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-10918 | ||
| https://security.gentoo.org/glsa/201708-03 | vendor-advisoryx_refsource_GENTOO | |
| https://security.gentoo.org/glsa/201710-17 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2017-10918 | ||
| https://xenbits.xen.org/xsa/advisory-222.html | x_refsource_CONFIRMMailing ListMitigationThird Party Advisory |
Change history (0)
No recorded changes yet.