{"cve":"CVE-2010-4255","nvd":{"published":"2011-01-25T01:00:01.393","modified":"2026-06-16T23:24:26.950","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.html","http://openwall.com/lists/oss-security/2010/11/30/5","http://openwall.com/lists/oss-security/2010/11/30/8","http://secunia.com/advisories/42884","http://secunia.com/advisories/46397"],"products":["citrix:xen"],"source":"nvd","synced_at":"2026-10-19T19:57:56.749847046+00:00"},"epss":{"cve":"CVE-2010-4255","score":0.00768,"percentile":0.55565,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}