Bug 1052914 (CVE-2014-1438) - CVE-2014-1438 kernel: x86: exceptions are not cleared in AMD FXSAVE workaround
Summary: CVE-2014-1438 kernel: x86: exceptions are not cleared in AMD FXSAVE workaround
Status: CLOSED ERRATA
Alias: CVE-2014-1438
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20131230,repor...
Keywords: Security
Depends On: 1053596 1053597 1053598 1053599
Blocks: 1047328
TreeView+ depends on / blocked
 
Reported: 2014-01-14 11:45 UTC by Prasad J Pandit
Modified: 2019-06-08 19:51 UTC (History)
9 users (show)

(edit)
Clone Of:
(edit)
Last Closed: 2014-04-28 17:37:12 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0439 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2014-04-28 20:43:50 UTC

Description Prasad J Pandit 2014-01-14 11:45:37 UTC
Linux kernel is found to be vulnerable to a NULL pointer dereference flaw
caused due to inappropriate handling of Floating Point Unit(FPU) exceptions
during task switch at 'emms' instruction. This only affects AMD CPU family
in both i386 & AMD64 modes.

A user/program could use this flaw to kill tasks at random resulting in DoS
or potentially gain root privileges if allowed to map NULL(mmap_min_addr=0)
page.

Upstream fix:
-------------
 -> https://git.kernel.org/linus/26bef1318adc1b3a530ecc807ef99346db2aa8b0

Reference:
----------
 -> https://lkml.org/lkml/2013/12/28/95
 -> http://www.openwall.com/lists/oss-security/2014/01/12/1
 -> http://www.halfdog.net/Security/2013/Vm86SyscallTaskSwitchKernelPanic/

Comment 1 Prasad J Pandit 2014-01-15 13:22:57 UTC
Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6.

Comment 4 Prasad J Pandit 2014-01-15 13:27:00 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1053599]

Comment 5 Fedora Update System 2014-01-20 03:04:34 UTC
kernel-3.12.8-200.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-01-20 03:07:41 UTC
kernel-3.12.8-300.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 errata-xmlrpc 2014-04-28 16:53:43 UTC
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0439 https://rhn.redhat.com/errata/RHSA-2014-0439.html


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