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CVE-2015-7835

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.

Published:Oct 29, 2015

Last Modified:Apr 12, 2025

EPS:Oct 30, 2015

EPSS Score:0.00122

CVSS Score:7.2

Affected Products

Vendor

Product

Action

Vendor

Xen

Product

Xen

Xen

Xen

Exploits

No exploit reference

Common Weakness Enumeration

CWE-20 Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-10 Buffer Overflow via Environment Variables

CAPEC-101 Server Side Include (SSI) Injection

CAPEC-104 Cross Zone Scripting

CAPEC-108 Command Line Execution through SQL Injection

CAPEC-109 Object Relational Mapping Injection

CAPEC-110 SQL Injection through SOAP Parameter Tampering

CAPEC-120 Double Encoding

CAPEC-13 Subverting Environment Variable Values

CAPEC-135 Format String Injection

CAPEC-136 LDAP Injection

CAPEC-14 Client-side Injection-induced Buffer Overflow

CAPEC-153 Input Data Manipulation

CAPEC-182 Flash Injection

CAPEC-209 XSS Using MIME Type Mismatch

CAPEC-22 Exploiting Trust in Client

CAPEC-23 File Content Injection

CAPEC-230 Serialized Data with Nested Payloads

CAPEC-231 Oversized Serialized Data Payloads

CAPEC-24 Filter Failure through Buffer Overflow

CAPEC-250 XML Injection

CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data

CAPEC-267 Leverage Alternate Encoding

CAPEC-28 Fuzzing

CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters

CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies

CAPEC-42 MIME Conversion

CAPEC-43 Exploiting Multiple Input Interpretation Layers

CAPEC-45 Buffer Overflow via Symbolic Links

CAPEC-46 Overflow Variables and Tags

CAPEC-47 Buffer Overflow via Parameter Expansion

CAPEC-473 Signature Spoof

CAPEC-52 Embedding NULL Bytes

CAPEC-53 Postfix, Null Terminate, and Backslash

CAPEC-588 DOM-Based XSS

CAPEC-63 Cross-Site Scripting (XSS)

CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic

CAPEC-664 Server Side Request Forgery

CAPEC-67 String Format Overflow in syslog()

CAPEC-7 Blind SQL Injection

CAPEC-71 Using Unicode Encoding to Bypass Validation Logic

CAPEC-72 URL Encoding

CAPEC-73 User-Controlled Filename

CAPEC-78 Using Escaped Slashes in Alternate Encoding

CAPEC-79 Using Slashes in Alternate Encoding

CAPEC-8 Buffer Overflow in an API Call

CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic

CAPEC-81 Web Server Logs Tampering

CAPEC-83 XPath Injection

CAPEC-85 AJAX Footprinting

CAPEC-88 OS Command Injection

CAPEC-9 Buffer Overflow in Local Command-Line Utilities

Related CVEs

CVE-2026-79603 (CVSS 4.3) — x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is on…

CVE-2026-79602 (CVSS 8.8) — A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.…

CVE-2026-62437 (CVSS 6.5) — When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which …

CVE-2026-62434 (CVSS 5.3) — A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest…

CVE-2026-62433 (CVSS 7.3) — Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given …

CVE-2026-62432 (CVSS 7.3) — The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding th…

CVE-2026-62431 (CVSS 7.5) — The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor va…

CVE-2026-62430 (CVSS 7.5) — Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache th…

CVE-2026-62429 (CVSS 6.5) — Accessing the vNUMA configuration data of a guest is still possible when domain destruction has already starte…

CVE-2026-62436 (CVSS 6.5) — [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities corresp…

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171249.html

http://lists.opensuse.org/opensuse-updates/2015-11/msg00063.html

http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html

http://support.citrix.com/article/CTX202404

http://www.debian.org/security/2015/dsa-3390

http://www.securityfocus.com/bid/77366

http://www.securitytracker.com/id/1034032

http://xenbits.xen.org/xsa/advisory-148.html

https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-022-2015.txt

https://security.gentoo.org/glsa/201604-03

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171249.html

http://lists.opensuse.org/opensuse-updates/2015-11/msg00063.html

http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html

http://support.citrix.com/article/CTX202404

http://www.debian.org/security/2015/dsa-3390

http://www.securityfocus.com/bid/77366

http://www.securitytracker.com/id/1034032

http://xenbits.xen.org/xsa/advisory-148.html

https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-022-2015.txt

https://security.gentoo.org/glsa/201604-03

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High