CVE-2015-3290

Description

A flaw was found in the way the Linux kernel's nested NMI handler and espfix64 functionalities interacted during NMI processing. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.

Statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6 since they did not backport the nested NMI handler and espfix64 functionalities.

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2 since they did not backport the espfix64 functionality and also did not backport upstream commit e00b12e64be9a3 that allowed an unprivileged local user to re-enable NMIs from the NMI handler.

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 v2 Score Breakdown

Red HatNVDcve.org
Base Score7.27.2N/A
Attack VectorLocalLocalN/A
Access ComplexityLowLowN/A
AuthenticationNoneNoneN/A
Confidentiality ImpactCompleteCompleteN/A
Integrity ImpactCompleteCompleteN/A
Availability ImpactCompleteCompleteN/A

Vector

Red Hat: AV:L/AC:L/Au:N/C:C/I:C/A:C

NVD: AV:L/AC:L/Au:N/C:C/I:C/A:C

Understanding the Weakness (CWE)

CWE-435

Integrity

Technical Impact: Unexpected State; Varies by Context

Acknowledgements

Red Hat would like to thank Andy Lutomirski for reporting this issue.

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