It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #DB (debug exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel.
Find out more about CVE-2015-8104 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the version of the kvm & xen packages as shipped with Red Hat Enterprise Linux 5.
This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.
This issue affects the version of Linux kernel as shipped with
Red Hat Enterprise Linux 6 and 7. Future kernel updates for the respective releases may address this issue.
Red Hat Enterprise Linux 5 is now in Production Phase 3 of the support and
maintenance life cycle. Thus it 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/.
| Base Score | 5.2 |
|---|---|
| Base Metrics | AV:A/AC:M/Au:S/C:N/I:N/A:C |
| Access Vector | Adjacent Network |
| Access Complexity | Medium |
| Authentication | Single |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux Extended Update Support 7.1 (kernel) | RHSA-2016:0103 | 2016-02-02 |
| Red Hat Enterprise Linux Advanced Update Support 6.5 (kernel) | RHSA-2015:2645 | 2015-12-15 |
| Red Hat Enterprise Linux 7 (kernel) | RHSA-2015:2552 | 2015-12-08 |
| Red Hat Enterprise Linux Extended Update Support 6.6 (kernel) | RHSA-2016:0024 | 2016-01-12 |
| Red Hat Enterprise Linux Advanced Update Support 6.2 (kernel) | RHSA-2016:0046 | 2016-01-19 |
| Red Hat Enterprise Linux 6 (kernel) | RHSA-2015:2636 | 2015-12-15 |
| Red Hat Enterprise Linux Advanced Update Support 6.4 (kernel) | RHSA-2016:0004 | 2016-01-07 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected |
| Red Hat Enterprise Linux 5 | xen | Will not fix |
| Red Hat Enterprise Linux 5 | kvm | Will not fix |
| Red Hat Enterprise Linux 5 | kernel | Not affected |
Vulmon