Details

Updated kvm packages that fix one security issue are now available for RedHat Enterprise Linux 5.Red Hat Product Security has rated this update as having Important securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution forLinux on AMD64 and Intel 64 systems.An out-of-bounds memory access flaw was found in the way QEMU’s virtualFloppy Disk Controller (FDC) handled FIFO buffer access while processingcertain FDC commands. A privileged guest user could use this flaw to crashthe guest or, potentially, execute arbitrary code on the host with theprivileges of the host’s QEMU process corresponding to the guest.(CVE-2015-3456)Red Hat would like to thank Jason Geffner of CrowdStrike for reportingthis issue.All kvm users are advised to upgrade to these updated packages, whichcontain a backported patch to correct this issue. Note: The procedure inthe Solution section must be performed before this update will take effect.

Solution
Before applying this update, make sure all previously released erratarelevant to your system have been applied.For details on how to apply this update, refer to:https://access.redhat.com/articles/11258The following procedure must be performed before this update will takeeffect:1) Stop all KVM guest virtual machines.2) Either reboot the hypervisor machine or, as the root user, remove (using”modprobe -r [module]”) and reload (using “modprobe [module]”) all of thefollowing modules which are currently running (determined using “lsmod”):kvm, ksm, kvm-intel or kvm-amd.3) Restart the KVM guest virtual machines.
Updated packages

RHEL Desktop Multi OS (v. 5 client)

SRPMS:
kvm-83-272.el5_11.src.rpm
    MD5: 1d00a54de5c7d487b355869f8d4e0e55SHA-256: 7d2060f8ce705ff01b3096089b6fce535d240db5c605b0d8dcd5f4648d0a4880
 
x86_64:
kmod-kvm-83-272.el5_11.x86_64.rpm
    MD5: b6dd55135de7fa5c782d9d01daeba0c3SHA-256: 0dc773aaa5438283c196ec9b8d7cb3fab41e0f3b594ccad1c8849989019679dc
kmod-kvm-debug-83-272.el5_11.x86_64.rpm
    MD5: 0992fd9e49414f5d3ff71c8e850f8c87SHA-256: 252a04502ad2603cb61ec931cd7fcab6d73de672aa7c830d8203d9b225bf0dad
kvm-83-272.el5_11.x86_64.rpm
    MD5: 05f62d8488dd3986c4d87575b3b6f60bSHA-256: 5fe798515ac14327b6b24e7695676d5df6771342cd4844ae62351aaab30f67b7
kvm-debuginfo-83-272.el5_11.x86_64.rpm
    MD5: ffee7ecb525382a4c75aa3c49fabfa15SHA-256: 9d218bc32afc39757299606106f93ca3fc3e62cb4c1ad5f15c32ddca55e2ebbd
kvm-qemu-img-83-272.el5_11.x86_64.rpm
    MD5: be3956d830ed6664ce8278ab5b53142cSHA-256: d187548d17171c036f2fadcdc91b474cc0a97c5fcb030937700dbeb037e2f829
kvm-tools-83-272.el5_11.x86_64.rpm
    MD5: 9d2a09052f9ae2da00e2e735db9534c2SHA-256: dec6eedf57bd0d5f489e7cf8e2d8ab56e22b84f5eb20f9f2606856990580814c
 
RHEL Virtualization (v. 5 server)

SRPMS:
kvm-83-272.el5_11.src.rpm
    MD5: 1d00a54de5c7d487b355869f8d4e0e55SHA-256: 7d2060f8ce705ff01b3096089b6fce535d240db5c605b0d8dcd5f4648d0a4880
 
x86_64:
kmod-kvm-83-272.el5_11.x86_64.rpm
    MD5: b6dd55135de7fa5c782d9d01daeba0c3SHA-256: 0dc773aaa5438283c196ec9b8d7cb3fab41e0f3b594ccad1c8849989019679dc
kmod-kvm-debug-83-272.el5_11.x86_64.rpm
    MD5: 0992fd9e49414f5d3ff71c8e850f8c87SHA-256: 252a04502ad2603cb61ec931cd7fcab6d73de672aa7c830d8203d9b225bf0dad
kvm-83-272.el5_11.x86_64.rpm
    MD5: 05f62d8488dd3986c4d87575b3b6f60bSHA-256: 5fe798515ac14327b6b24e7695676d5df6771342cd4844ae62351aaab30f67b7
kvm-debuginfo-83-272.el5_11.x86_64.rpm
    MD5: ffee7ecb525382a4c75aa3c49fabfa15SHA-256: 9d218bc32afc39757299606106f93ca3fc3e62cb4c1ad5f15c32ddca55e2ebbd
kvm-qemu-img-83-272.el5_11.x86_64.rpm
    MD5: be3956d830ed6664ce8278ab5b53142cSHA-256: d187548d17171c036f2fadcdc91b474cc0a97c5fcb030937700dbeb037e2f829
kvm-tools-83-272.el5_11.x86_64.rpm
    MD5: 9d2a09052f9ae2da00e2e735db9534c2SHA-256: dec6eedf57bd0d5f489e7cf8e2d8ab56e22b84f5eb20f9f2606856990580814c
 
(The unlinked packages above are only available from the Red Hat Network)Bugs fixed (see bugzilla for more information)

1218611 – CVE-2015-3456 qemu: fdc: out-of-bounds fifo buffer memory access

References

https://www.redhat.com/security/data/cve/CVE-2015-3456.htmlhttps://access.redhat.com/security/updates/classification/#important

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from:https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/

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