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
Keywords:
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:
Depends On: 1053596 1053597 1053598 1053599
Blocks: 1047328
TreeView+ depends on / blocked
 
Reported: 2014-01-14 11:45 UTC by Prasad Pandit
Modified: 2021-02-17 06:59 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-04-28 17:37:12 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0439 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2014-04-28 20:43:50 UTC

Description Prasad 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 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 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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