xen: DoS via non-preemptable L3/L4 pagetable freeing (XSA-252)
Published Feb 27, 2018
6.5
MEDIUMCVSS 3.0
EPSS 0.43%
Description
An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.
Affected products
No data.
Configuration 2
- 9.0
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:L/UI:N/S:C/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:H/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
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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.43% (0.00427) | 34.60th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.44% (0.00442) | 34.96th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00068) | 18.28th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00062) | 28.60th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.06% (0.00062) | 26.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00062) | 24.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 22, 2023 | 1.28% (0.01282) | 68.05th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.57% (0.02567) | 55.02th | v1 |
| Jan 6, 2022 | 2.57% (0.02567) | 54.58th | v1 |
| Sep 1, 2021 | 2.57% (0.02567) | 78.88th | v1 |
| Apr 14, 2021 | 2.57% (0.02567) | 0.00th | v1 |
References (14)
- http://www.securityfocus.com/bid/103174 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1040773 vdb-entryx_refsource_SECTRACK
- http://xenbits.xen.org/xsa/advisory-252.html
- https://access.redhat.com/security/cve/CVE-2018-7540 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1544456 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2018/03/msg00003.html mailing-listx_refsource_MLISTThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-7540
- https://security.gentoo.org/glsa/201810-06 vendor-advisoryx_refsource_GENTOO
- https://support.citrix.com/article/CTX232096 x_refsource_CONFIRM
- https://support.citrix.com/article/CTX232655 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2018-7540
- https://www.debian.org/security/2018/dsa-4131 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://xenbits.xen.org/xsa/advisory-252.html x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.