The x86 emulator in KVM 83, when a guest is configured for Symmetric Multiprocessing (SMP), does not properly restrict writing of segment selectors to segment registers, which might allow guest OS users to cause a denial of service (guest OS crash) or gain privileges on the guest OS by leveraging access to a (1) IO port or (2) MMIO region, and replacing an instruction in between emulator entry and instruction fetch.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Kvm | Kvm_qumranet | 83 (including) | 83 (including) |
| Red Hat Enterprise Linux 5 | RedHat | kvm-0:83-105.el5_4.27 | * |
| Red Hat Enterprise Virtualization for RHEL-5 | RedHat | rhev-hypervisor-0:5.4-2.1.10.el5_4rhev2_1 | * |
| Kvm | Ubuntu | hardy | * |
| Kvm | Ubuntu | intrepid | * |
| Kvm | Ubuntu | jaunty | * |
| Linux | Ubuntu | intrepid | * |
| Linux | Ubuntu | jaunty | * |
| Linux | Ubuntu | karmic | * |
| Linux | Ubuntu | upstream | * |
| Linux-ec2 | Ubuntu | karmic | * |
| Linux-ec2 | Ubuntu | maverick | * |
| Linux-ec2 | Ubuntu | upstream | * |
| Linux-fsl-imx51 | Ubuntu | karmic | * |
| Linux-fsl-imx51 | Ubuntu | lucid | * |
| Linux-lts-backport-maverick | Ubuntu | upstream | * |
| Linux-mvl-dove | Ubuntu | karmic | * |
References
- http://securitytracker.com/id?1023663
- http://www.redhat.com/support/errata/RHSA-2010-0126.html
- http://www.securityfocus.com/bid/38467
- https://bugzilla.redhat.com/show_bug.cgi?id=563463
- https://exchange.xforce.ibmcloud.com/vulnerabilities/56662
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10139
- http://securitytracker.com/id?1023663
- http://www.redhat.com/support/errata/RHSA-2010-0126.html
- http://www.securityfocus.com/bid/38467
- https://bugzilla.redhat.com/show_bug.cgi?id=563463
- https://exchange.xforce.ibmcloud.com/vulnerabilities/56662
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10139