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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xen | 4.0.1-2 | — |
| Debian 13 | xen | 4.0.1-2 | — |
| Debian 12 | xen | 4.0.1-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-238.el5 | RHSA-2011:0017 |
Advisories 1
- RHSA-2011:0017 Red Hat Security Advisory: Red Hat Enterprise Linux 5.6 kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 20111013 VMSA-2011-0012 VMware ESXi and ESX updates to third party libraries and ESX Service Console mailing-list
- RHSA-2011:0017 vendor-advisory
- 46397 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=658155
- [oss-security] 20101130 CVE request: xen: x86-64: don't crash Xen upon direct pv guest access mailing-list
- http://www.vmware.com/security/advisories/VMSA-2011-0012.html
- 42884 third-party-advisory
- [xen-devel] 20101129 [PATCH] x86-64: don't crash Xen upon direct pv guest access mailing-list
- [oss-security] 20101130 Re: CVE request: xen: x86-64: don't crash Xen upon direct pv guest access mailing-list