The kvm_emulate_hypercall function in arch/x86/kvm/x86.c in KVM in the Linux kernel 2.6.25-rc1, and other versions before 2.6.31, when running on x86 systems, does not prevent access to MMU hypercalls from ring 0, which allows local guest OS users to cause a denial of service (guest kernel crash) and read or write guest kernel memory via unspecified random addresses.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel | Linux | * | 2.6.30 (including) |
| Linux_kernel | Linux | 2.6.25-rc1 (including) | 2.6.25-rc1 (including) |
| Red Hat Enterprise Linux 5 | RedHat | kvm-0:83-105.el5_4.7 | * |
| Linux | Ubuntu | hardy | * |
| Linux | Ubuntu | intrepid | * |
| Linux | Ubuntu | jaunty | * |
| Linux | Ubuntu | upstream | * |
| Linux-source-2.6.15 | Ubuntu | upstream | * |
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=07708c4af1346ab1521b26a202f438366b7bcffd
- http://patchwork.kernel.org/patch/38926/
- http://secunia.com/advisories/37105
- http://www.openwall.com/lists/oss-security/2009/09/18/1
- http://www.openwall.com/lists/oss-security/2009/09/21/1
- http://www.openwall.com/lists/oss-security/2009/09/22/8
- http://www.redhat.com/support/errata/RHSA-2009-1465.html
- http://www.ubuntu.com/usn/USN-852-1
- https://bugzilla.redhat.com/show_bug.cgi?id=524124
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11328
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=07708c4af1346ab1521b26a202f438366b7bcffd
- http://patchwork.kernel.org/patch/38926/
- http://secunia.com/advisories/37105
- http://www.openwall.com/lists/oss-security/2009/09/18/1
- http://www.openwall.com/lists/oss-security/2009/09/21/1
- http://www.openwall.com/lists/oss-security/2009/09/22/8
- http://www.redhat.com/support/errata/RHSA-2009-1465.html
- http://www.ubuntu.com/usn/USN-852-1
- https://bugzilla.redhat.com/show_bug.cgi?id=524124
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11328