Description
The subpage MMIO initialization functionality in the subpage_register function in exec.c in QEMU-KVM, as used in the Hypervisor (aka rhev-hypervisor) in Red Hat Enterprise Virtualization (RHEV) 2.2 and KVM 83, does not properly select the index for access to the callback array, which allows guest OS users to cause a denial of service (guest OS crash) or possibly gain privileges via unspecified vectors.
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 | rhev-hypervisor +1 | 5.5-2.2.6.1.el5_5rhev2_2 | RHSA-2010:0622 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Virtualization 5 | kvm +3 | 83-164.el5_5.21 | RHSA-2010:0627 |
Advisories 2
- RHSA-2010:0627 Red Hat Security Advisory: kvm security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2010:0622 Red Hat Security Advisory: rhev-hypervisor security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
References
- RHSA-2010:0627 vendor-advisory
- RHSA-2010:0622 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=619411
- [kvm] 20100728 [PATCH 1/2] Fix segfault in mmio subpage handling code mailing-list