Qemu emulator built with the PCI MSI-X support is vulnerable to null pointer dereference issue. It occurs when the controller attempts to write to the pending bit array(PBA) memory region. Because the MSI-X MMIO support did not define the .write method. A privileges used inside guest could use this flaw to crash the Qemu process resulting in DoS issue. Upstream fix: ------------- -> http://git.qemu.org/?p=qemu.git;a=commit;h=43b11a91dd861a946b231b89b754285 Reference: ---------- -> http://www.openwall.com/lists/oss-security/2015/12/14/2
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1291139]
Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1291138]
Statement: This issue does not affect the versions of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5. This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6, and the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3. This issue affects the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 7. This issue affects the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Acknowledgements: This issue was reported by Qinghao Tang of QIHU 360 Marvel Team.
qemu-2.4.1-5.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
qemu-2.3.1-10.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.5.2-7.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.5.2-7.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
*** Bug 1256420 has been marked as a duplicate of this bug. ***