PT-2016-6776 · Linux+2 · Linux Kernel+2

Pengfei Wang · Published 2016-08-06 · Updated 2017-03-22 · CVE-2016-6156

Positive Technologies (AI Summary)

CVSS v3.1

5.1

Medium

Base vector

AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.7

Description The issue is related to a race condition in the ec device ioctl xcmd function, which can be exploited by local users to cause a denial of service through an out-of-bounds array access. This is achieved by changing a certain size value, and it is also known as a "double fetch" vulnerability.

Recommendations For Linux kernel versions prior to 4.7, update to version 4.7 or later to resolve the issue. As a temporary workaround, consider restricting access to the ec device ioctl xcmd function to minimize the risk of exploitation.

Fix

DoS

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

ALT-PU-2016-1853

ALT-PU-2017-1330

CVE-2016-6156

USN-3084-1

USN-3084-2

USN-3084-3

USN-3084-4

Affected Products

Alt Linux

Linux Kernel

Ubuntu

References · 23

• https://github.com/torvalds/linux/commit/096cdc6f52225835ff503f987a0d68ef770bb78e · Patch
• https://ubuntu.com/security/notices/USN-3084-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3084-3 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2016-6156 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2016-6156 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3084-4 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3084-3 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3084-4 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-6156 · Security Note
• https://ubuntu.com/security/notices/USN-3084-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-5412 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-6156 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3084-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2016-6156 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-6136 · Vendor Advisory