Bug 505704 (CVE-2014-1438)

Summary:	Kernel: missing CPU-state sanitation during task-switch causes DOS / privilege escalation (CVE-2014-1438)
Product:	Gentoo Security	Reporter:	Agostino Sarubbo <ago>
Component:	Kernel	Assignee:	Gentoo Kernel Security <security-kernel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kernel
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Agostino Sarubbo gentoo-dev

2014-03-25 13:28:39 UTC

CVE-2014-1438 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-1438):

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.

Comment 1 John Helmert III archtester

2022-03-25 21:50:32 UTC

Fix in 3.13, https://github.com/torvalds/linux/commit/26bef1318adc1b3a530ecc807ef99346db2aa8b0