Vulnerability CVE-2014-1438
Published: 2014-01-18   Modified: 2014-01-19

Description:
The restore_fpu_checking function in arch/x86/include/asm/fpu-internal.h in the Linux kernel before 3.12.8 on the AMD K7 and K8 platforms does not clear pending exceptions before proceeding to an EMMS instruction, which allows local users to cause a denial of service (task kill) or possibly gain privileges via a crafted application.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Linux Kernel missing CPU-state sanitation DOS / privilege escalation
halfdog
12.01.2014

Type:

CWE-264

 (Permissions, Privileges, and Access Controls)

CVSS2 => (AV:L/AC:M/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.7/10
6.9/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=26bef1318adc1b3a530ecc807ef99346db2aa8b0
https://lkml.org/lkml/2014/1/9/637
https://github.com/torvalds/linux/commit/26bef1318adc1b3a530ecc807ef99346db2aa8b0
https://bugzilla.redhat.com/show_bug.cgi?id=1052914
http://www.securityfocus.com/bid/64781
http://www.openwall.com/lists/oss-security/2014/01/14/1
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.12.8
http://www.halfdog.net/Security/2013/Vm86SyscallTaskSwitchKernelPanic/
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