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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel 32-bit Emulation Flaw Lets Local Users Bypass Security Restrictions
SecurityTracker Alert ID:  1032413
SecurityTracker URL:  http://securitytracker.com/id/1032413
CVE Reference:   CVE-2015-2830   (Links to External Site)
Date:  May 28 2015
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.19.2
Description:   A vulnerability was reported in the Linux Kernel. A local user can bypass security controls on the target system.

A local user can make a specially crafted fork(2) or close(2) system call with an 'int80' entry to bypass the seccomp or audit protection mechanism and potentially gain elevated privileges.

The vulnerability resides in 'arch/x86/kernel/entry_64.S'.

Systems built with the 32-bit emulation support(CONFIG_IA32_EMULATION) are affected.


Impact:   A local user can bypass security restrictions on the target system.
Solution:   The vendor has issued a fix (3.19.2).

The vendor's advisory is available at:

http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.19.2

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 12 2015 (Ubuntu Issues Fix) Linux Kernel 32-bit Emulation Flaw Lets Local Users Bypass Security Restrictions
Ubuntu has issued a fix for Ubuntu 12.04 LTS.
Jun 25 2015 (CentOS Issues Fix) Linux Kernel 32-bit Emulation Flaw Lets Local Users Bypass Security Restrictions
CentOS has issued a fix for CentOS 7.
Jul 16 2015 (CentOS Issues Fix) Linux Kernel 32-bit Emulation Flaw Lets Local Users Bypass Security Restrictions
CentOS has issued a fix for CentOS 6.
Jul 31 2015 (Oracle Issues Fix for Oracle Linux) Linux Kernel 32-bit Emulation Flaw Lets Local Users Bypass Security Restrictions
Oracle has issued a fix for Oracle Linux 6 and 7.



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