CVE-2015-7835: xen Improper Input Validation
Vulnerability summary
CVE-2015-7835 is a high (CVSS 7.2) Improper Input Validation vulnerability in xen. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 37% of scored vulnerabilities.
Not severe (CVSS 7.2, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 8Timeline
- 30-10-2015PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The mod_l2_entry function in arch/x86/mm.c in Xen 3.4 through 4.6.x does not properly validate level 2 page table entries, which allows local PV guest administrators to gain privileges via a crafted superpage mapping.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.43% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-264Permissions, Privileges, and Access ControlsWeaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.
Affected systems
Known conditions: local access, no authentication (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- xen< 4.6.0-1 | < 4.1.4-3+deb7u9 | < 4.4.1-9+deb8u2
Ubuntu1 product
- xen< 4.4.2-0ubuntu0.14.04.3
Xen1 product
- xen3.4.0 | 3.4.1 | 3.4.2 | 3.4.3 | 3.4.4 | 4.0.0 | 4.0.1 | 4.0.2 | 4.0.3 | 4.0.4 | 4.1.0 | 4.1.1 | 4.1.2 | 4.1.3 | 4.1.4 | 4.1.5 | 4.1.6.1 | 4.2.0 | 4.2.1 | 4.2.2 | 4.2.3 | 4.3.0 | 4.3.1 | 4.3.2 | 4.3.4 | 4.4.0 | 4.4.1 | 4.5.0 | 4.5.1 | 4.6.0
3 vendors · 3 products
References
15 links- support.citrix.com/article/CTX202404X Refsource CONFIRM
- lists.fedoraproject.org/pipermail/package-announce/2015-November/171249.htmlVendor AdvisoryX Refsource FEDORA
- lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.htmlVendor AdvisoryX Refsource FEDORA
Show all 15 references
- lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.htmlVendor AdvisoryX Refsource FEDORA