Bug 1204722 (CVE-2015-2666) - CVE-2015-2666 kernel: execution in the early microcode loader
Summary: CVE-2015-2666 kernel: execution in the early microcode loader
Status: NEW
Alias: CVE-2015-2666
Product: Security Response
Classification: Other
Component: vulnerability   
(Show other bugs)
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20150219,repor...
Keywords: Security
Depends On: 1204724 1206829 1206830 1206831 1206832
Blocks: 1204723
TreeView+ depends on / blocked
 
Reported: 2015-03-23 12:15 UTC by Vasyl Kaigorodov
Modified: 2019-02-08 14:56 UTC (History)
31 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A stack-based buffer overflow flaw was found in the Linux kernel's early load microcode functionality. On a system with UEFI Secure Boot enabled, a local, privileged user could use this flaw to increase their privileges to the kernel (ring0) level, bypassing intended restrictions in place.
Story Points: ---
Clone Of:
Environment:
Last Closed:
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:1534 normal SHIPPED_LIVE Moderate: kernel security and bug fix update 2015-08-06 06:42:13 UTC
Red Hat Product Errata RHSA-2015:1565 normal SHIPPED_LIVE Moderate: kernel-rt security, bug fix, and enhancement update 2015-08-06 00:13:24 UTC

Description Vasyl Kaigorodov 2015-03-23 12:15:35 UTC
It was found that the Linux kernel's Intel early microcode loader was vulnerable to a stack overflow.

On a UEFI Secure Boot enabled system, a local root user could use this flaw to increase their privileges to the kernel (ring0) level despite the additional restrictions in place.

Upstream fix:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=f84598bd7c851f8b0bf8cd0d7c3be0d73c432ff4

Comment 1 Vasyl Kaigorodov 2015-03-23 12:17:02 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1204724]

Comment 4 Petr Matousek 2015-03-28 22:14:08 UTC
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enteprise MRG 2. Future kernel and kernel-rt updates for Red Hat Enterprise Linux 7 may address this issue.

Comment 5 Fedora Update System 2015-03-29 04:31:18 UTC
kernel-3.19.2-201.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-04-07 07:29:36 UTC
kernel-3.19.3-100.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 errata-xmlrpc 2015-08-05 20:13:40 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1565 https://access.redhat.com/errata/RHSA-2015:1565

Comment 9 errata-xmlrpc 2015-08-06 02:42:36 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1534 https://rhn.redhat.com/errata/RHSA-2015-1534.html


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