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…
Does this matter?
Lower severity and a low EPSS score (0.77%). Track it; it rarely justifies an emergency change on its own.
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 2.0
- 6.1 MEDIUMAV:A/AC:L/Au:N/C:N/I:N/A:C
- EPSS
- 0.77% probability · 54th percentile
- CISA KEV
- Not listed
- Affected
- citrix/xen
- Source
- secalert@redhat.com
References
- http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.htmlPatch
- http://openwall.com/lists/oss-security/2010/11/30/5Patch
- http://openwall.com/lists/oss-security/2010/11/30/8Patch
- 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=658155Patch
- http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.htmlPatch
- http://openwall.com/lists/oss-security/2010/11/30/5Patch
- http://openwall.com/lists/oss-security/2010/11/30/8Patch
- 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=658155Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.