Bug 1052914 - (CVE-2014-1438) CVE-2014-1438 kernel: x86: exceptions are not cleared in AMD FXSAVE workaround
CVE-2014-1438 kernel: x86: exceptions are not cleared in AMD FXSAVE workaround
Status: CLOSED ERRATA
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=20131230,repor...
: Security
Depends On: 1053596 1053597 1053598 1053599
Blocks: 1047328
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Reported: 2014-01-14 06:45 EST by Prasad J Pandit
Modified: 2015-08-24 16:06 EDT (History)
9 users (show)

See Also:
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Doc Type: Bug Fix
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Last Closed: 2014-04-28 13:37:12 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Prasad J Pandit 2014-01-14 06:45:37 EST
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:
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 -> 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 08:22:57 EST
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 08:27:00 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1053599]
Comment 5 Fedora Update System 2014-01-19 22:04:34 EST
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 2014-01-19 22:07:41 EST
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 12:53:43 EDT
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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