Description
The hypervisor_callback function in Xen, possibly before 3.4.0, as applied to the Linux kernel 2.6.30-rc4, 2.6.18, and probably other versions allows guest user applications to cause a denial of service (kernel oops) of the guest OS by triggering a segmentation fault in "certain address ranges."
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 5.0 | linux-2.6 | 2.6.26-15lenny3 | DSA-1809-1 |
| Debian 5.0 | user-mode-linux | 2.6.26-1um-2+15lenny3 | DSA-1809-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-128.1.14.el5 | RHSA-2009:1106 |
| RHEL 4 | kernel +10 | 2.6.9-89.0.3.EL | RHSA-2009:1132 |
Advisories 3
- RHSA-2009:1132 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2009:1106 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-1809-1 linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 35093 third-party-advisory
- [oss-security] 20090514 CVE Request: XEN local denial of service mailing-list
- oval:org.mitre.oval:def:10313 vdb-entry signature
- 35298 third-party-advisory
- 34957 vdb-entry
- [Xen-devel] 20090513 [PATCH] linux/i386: hypervisor_callback adjustments mailing-list
- DSA-1809 vendor-advisory