CVE-2015-8338
Description
A flaw was discovered in xen host that prevented the use of a physical CPU for a significant period of time. This can cause a softlockup or watchdog timeout in both the host and other guests.
Statement
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and 7, Red Hat Enterprise MRG 2, and realtime kernels.
At the time of writing, XEN on Red Hat Enterprise Linux 5 did not support ARM guests. XEN was not available on versions Red Hat Enterprise Linux 6 and 7, Red Hat Enterprise MRG 2, and realtime kernels.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.2 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v2 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 7.2 | N/A |
| Attack Vector | Network | Local | N/A |
| Access Complexity | Medium | Low | N/A |
| Authentication | Single | None | N/A |
| Confidentiality Impact | None | Complete | N/A |
| Integrity Impact | None | Complete | N/A |
| Availability Impact | Complete | Complete | N/A |
Vector
Red Hat: AV:N/AC:M/Au:S/C:N/I:N/A:C
NVD: AV:L/AC:L/Au:N/C:C/I:C/A:C
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Inconsistent locking discipline can lead to deadlock.
Acknowledgements
Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Julien Grall (Citrix) as the original reporter.
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