Permissions, Privileges, and Access Controls in Linux kernel - CVE-2014-1438

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Main Vulnerability Database Vulnerabilities #VU42139

Permissions, Privileges, and Access Controls in Linux kernel - CVE-2014-1438

Published: January 19, 2014 / Updated: August 10, 2020


Vulnerability identifier: #VU42139
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2014-1438
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-image-2.6.32-365-ec2 (Ubuntu package)
linux-lts-quantal (Ubuntu package)
linux-lts-raring (Ubuntu package)
linux-lts-saucy (Ubuntu package)

How to mitigate CVE-2014-1438

Install update from vendor's website.

linux (Ubuntu package) - addressed in versions 2.6.32-61.124, 3.2.0-60.91, 3.5.0-47.71, 3.11.0-17.31
linux-image-2.6.32-365-ec2 (Ubuntu package) - update to 2.6.32-365.79
linux-lts-quantal (Ubuntu package) - update to 3.5.0-47.71~precise1
linux-lts-raring (Ubuntu package) - update to 3.8.0-37.53~precise1
linux-lts-saucy (Ubuntu package) - update to 3.11.0-17.31~precise1

External References

Related Security Bulletins