CVE-2010-4255

Severity: medium (CVSS 6.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-01-25 · updated 2026-06-16

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.

Affected products

Citrix Xen: through 4.0.1; 3.0.2, 3.0.3, 3.0.4, 3.1.2, 3.1.3, 3.1.4 (+12) (and their updates)

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
http://www.redhat.com/support/errata/RHSA-2011-0017.html
http://www.securityfocus.com/archive/1/520102/100/0/threaded
http://www.vmware.com/security/advisories/VMSA-2011-0012.html
https://bugzilla.redhat.com/show_bug.cgi?id=658155
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

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