Description
The Xen hypervisor block backend driver for Linux kernel 2.6.18, when running on a 64-bit host with a 32-bit paravirtualized guest, allows local privileged users in the guest OS to cause a denial of service (host OS crash) via a request that specifies a large number of blocks.
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.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-53.1.19.el5 | RHSA-2008:0233 |
Advisories 1
- RHSA-2008:0233 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 29082 vdb-entry
- oval:org.mitre.oval:def:9452 vdb-entry signature
- https://bugzilla.redhat.com/show_bug.cgi?id=369531
- 30116 third-party-advisory
- RHSA-2008:0233 vendor-advisory
- 32918 third-party-advisory
- USN-679-1 vendor-advisory
- linux-kernel-xen-hypervisor-dos(42274) vdb-entry