Is CVE-2010-4255 in the CISA KEV catalog?

No. CVE-2010-4255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2010-4255?

CVE-2010-4255 has a CVSS v2 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2010-4255?

CVE-2010-4255 has an EPSS score of 0.76% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2010-4255?

Upgrade xen on debian 11 to 4.0.1-2 or later.

CVE & CISA-KEV Catalog

CVE-2010-4255

MEDIUM

6.1

CVSS v2

NVD

Description

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.

How to fix

Remediation Available

xenDebian

Fixed in:4.0.1-2CVE-2010-4255

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

0.76%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Patch4

Other references5

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.