Ubuntu update for Linux kernel

1) Resource exhaustion

EUVDB-ID: #VU4062

Risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2016-1583

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a local attacker to cause DoS condition and gain elevated privileges on the target system.

The weakness exists in the ecryptfs_privileged_open function in fs/ecryptfs/kthread.c due to stack memory consumption. A local attacker can cause the service to crash and gain elevated privileges via vectors involving crafted mmap calls for /proc pathnames, leading to recursive pagefault handling.

Mitigation

Update the affected packages

Ubuntu 14.04 LTS:

linux-image-3.13.0-88-powerpc64-emb 3.13.0-88.135

linux-image-3.13.0-88-powerpc-e500 3.13.0-88.135

linux-image-3.13.0-88-generic 3.13.0-88.135

linux-image-3.13.0-88-lowlatency 3.13.0-88.135

linux-image-3.13.0-88-powerpc64-smp 3.13.0-88.135

linux-image-3.13.0-88-powerpc-smp 3.13.0-88.135

linux-image-3.13.0-88-powerpc-e500mc 3.13.0-88.135

linux-image-3.13.0-88-generic-lpae 3.13.0-88.135

Vulnerable software versions

Ubuntu: 14.04

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*

External links

https://www.ubuntu.com/usn/usn-2999-1/

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. However, proof of concept for this vulnerability is available.