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Bug 1204722 - (CVE-2015-2666) CVE-2015-2666 kernel: execution in the early microcode loader
CVE-2015-2666 kernel: execution in the early microcode loader
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20150219,repor...
: Security
Depends On: 1204724 1206829 1206830 1206831 1206832
Blocks: 1204723
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Reported: 2015-03-23 08:15 EDT by Vasyl Kaigorodov
Modified: 2018-08-28 17:58 EDT (History)
32 users (show)

See Also:
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.
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RHEL 7.3 requirements from Atomic Host:
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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 02:42:13 EDT
Red Hat Product Errata RHSA-2015:1565 normal SHIPPED_LIVE Moderate: kernel-rt security, bug fix, and enhancement update 2015-08-05 20:13:24 EDT

  None (edit)
Description Vasyl Kaigorodov 2015-03-23 08:15:35 EDT 
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 08:17:02 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1204724]
Comment 4 Petr Matousek 2015-03-28 18:14:08 EDT 
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 00:31:18 EDT 
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 03:29:36 EDT 
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 16:13:40 EDT 
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 2015-08-05 22:42:36 EDT 
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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