CVE-2015-8340
Find out more about CVE-2015-8340 from the MITRE CVE dictionary dictionary and NIST NVD.
Statement
This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 6, 7, MRG-2 and realtime kernels.
At this time, there is no plans to fix this issue, if you feel that this issue
is affecting your deployment and have an EUS subscription, please contact
support to have this issue correctly prioritized
CVSS v2 metrics
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 6.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:S/C:N/I:N/A:C |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | Single |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Complete |
CVSS v3 metrics
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.2 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Affected Packages State
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 5 | xen | Will not fix |
Acknowledgements
Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Julien Grall of Citrix and Jan Beulich of SUSE as the original reporters.Mitigation
The vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. In Xen HVM, controlling the guest's kernel would involve locking down the bootloader.