xen: oxenstored does not apply quota-maxentity (XSA-272)
Published Aug 17, 2018
6.5
MEDIUMCVSS 3.0
EPSS 0.40%
Description
An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.
Affected products
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 v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.40% (0.00399) | 31.75th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.40% (0.00399) | 34.00th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.05% (0.00050) | 20.20th | v3 (v2023.03.01) |
| May 22, 2024 | 0.05% (0.00050) | 19.26th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.05% (0.00050) | 17.15th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00890) | 12.04th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (7)
- http://xenbits.xen.org/xsa/advisory-272.html x_refsource_MISCVendor Advisory
- https://access.redhat.com/security/cve/CVE-2018-15470 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1610552 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-15470
- https://security.gentoo.org/glsa/201810-06 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-15470
| Link | Providers | Tags |
|---|---|---|
| http://xenbits.xen.org/xsa/advisory-272.html | x_refsource_MISCVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2018-15470 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1610552 | Issue Tracking | |
| https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-15470 | ||
| https://security.gentoo.org/glsa/201810-06 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-15470 |
Change history (0)
No recorded changes yet.