CVE-2010-4255

The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

Published: 2011-01-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2010-4255 is rated Moderate Risk (49.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.82%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2010-4255

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 1.15% 0.82% -0.33%
2 2025-03-29 0.82% 1.15% +0.33%
3 2025-03-17 — 0.82% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2010-4255

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 2.0 MEDIUM
AV:A/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.5 6.9 [email protected]

Weakness enumeration for CVE-2010-4255

OS Trackers for CVE-2010-4255

vendor priority summary link
debian not yet assigned CVE-2010-4255 not yet assigned priority: Debian including 1 source packages (xen), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2010-4255
redhat medium — https://access.redhat.com/security/cve/CVE-2010-4255
ubuntu low CVE-2010-4255 low priority: Ubuntu including 4 source packages (xen, xen-3.1, xen-3.2, xen-3.3), 48 status rows across 12 suites (dapper, hardy, karmic, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, upstream): DNE 32, ignored 7, not-affected 5, needs-triage 3, released 1. https://ubuntu.com/security/CVE-2010-4255

Affected software / configurations for CVE-2010-4255

Vendor Product Version Raw CPE
citrix xen <= 4.0.1 cpe:2.3:a:citrix:xen:*:*:*:*:*:*:*:*
citrix xen 3.0.2 cpe:2.3:a:citrix:xen:3.0.2:*:*:*:*:*:*:*
citrix xen 3.0.3 cpe:2.3:a:citrix:xen:3.0.3:*:*:*:*:*:*:*
citrix xen 3.0.4 cpe:2.3:a:citrix:xen:3.0.4:*:*:*:*:*:*:*
citrix xen 3.1.2 cpe:2.3:a:citrix:xen:3.1.2:*:*:*:*:*:*:*
citrix xen 3.1.3 cpe:2.3:a:citrix:xen:3.1.3:*:*:*:*:*:*:*
citrix xen 3.1.4 cpe:2.3:a:citrix:xen:3.1.4:*:*:*:*:*:*:*
citrix xen 3.2.0 cpe:2.3:a:citrix:xen:3.2.0:*:*:*:*:*:*:*
citrix xen 3.2.1 cpe:2.3:a:citrix:xen:3.2.1:*:*:*:*:*:*:*
citrix xen 3.2.2 cpe:2.3:a:citrix:xen:3.2.2:*:*:*:*:*:*:*
citrix xen 3.2.3 cpe:2.3:a:citrix:xen:3.2.3:*:*:*:*:*:*:*
citrix xen 3.3.0 cpe:2.3:a:citrix:xen:3.3.0:*:*:*:*:*:*:*
citrix xen 3.3.1 cpe:2.3:a:citrix:xen:3.3.1:*:*:*:*:*:*:*
citrix xen 3.3.2 cpe:2.3:a:citrix:xen:3.3.2:*:*:*:*:*:*:*
citrix xen 3.4.0 cpe:2.3:a:citrix:xen:3.4.0:*:*:*:*:*:*:*
citrix xen 3.4.1 cpe:2.3:a:citrix:xen:3.4.1:*:*:*:*:*:*:*
citrix xen 3.4.2 cpe:2.3:a:citrix:xen:3.4.2:*:*:*:*:*:*:*
citrix xen 3.4.3 cpe:2.3:a:citrix:xen:3.4.3:*:*:*:*:*:*:*
citrix xen 4.0.0 cpe:2.3:a:citrix:xen:4.0.0:*:*:*:*:*:*:*

References for CVE-2010-4255

cvelogic Threat Intelligence