Ubuntu update for Linux kernel

1) Denial of service

EUVDB-ID: #VU1012

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-7042

CWE-ID: CWE-131 - Incorrect Calculation of Buffer Size

Exploit availability: No

Description

The vulnerability allows a local user to cause DoS conditions on the target system.
The weakness exists due to using of incorrect buffer size for certain timeout data by the proc_keys_show function in security/keys/proc.c while enabling of GNU Compiler Collection (gcc) stack protector. By reading the /proc/keys file attackers can trigger stack memory corruption.
Successful exploitation of the vulnerability may result in denial of service on the vulnerable system.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:

linux-image-4.4.0-47-powerpc64-emb 4.4.0-47.68

linux-image-powerpc-e500mc 4.4.0.47.50

linux-image-4.4.0-47-lowlatency 4.4.0-47.68

linux-image-4.4.0-47-powerpc64-smp 4.4.0-47.68

linux-image-4.4.0-47-generic 4.4.0-47.68

linux-image-4.4.0-47-powerpc-smp 4.4.0-47.68

linux-image-powerpc-smp 4.4.0.47.50

linux-image-generic-lpae 4.4.0.47.50

linux-image-powerpc64-emb 4.4.0.47.50

linux-image-virtual 4.4.0.47.50

linux-image-4.4.0-47-generic-lpae 4.4.0-47.68

linux-image-generic 4.4.0.47.50

linux-image-lowlatency 4.4.0.47.50

linux-image-4.4.0-47-powerpc-e500mc 4.4.0-47.68

linux-image-powerpc64-smp 4.4.0.47.50

Vulnerable software versions

Ubuntu: 16.04

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*

External links

https://www.ubuntu.com/usn/usn-3128-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.