Vulnerability identifier: #VU8117

Vulnerability risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-9922

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system
linux_kernel (Debian package)
Operating systems & Components / Operating system package or component

Vendor: Linux Foundation
Debian

Description
The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to improper privileges and access controls. A local attacker can provide a large filesystem stack that includes an overlayfs layer, related to fs/ecryptfs/main.c and fs/overlayfs/super.c and gain root privileges on the system.

Mitigation
Update to version 4.0.

Vulnerable software versions

Linux kernel: 3.10, 3.16.7-ckt25-2 - 3.16.43-2+deb8u2, 3.2 - 3.2.89-2, 3.8, 3.9, 3.5.1 - 3.5.5, 3.4 - 3.4.32, 3.3 - 3.3.8, 3.1 - 3.1.10, 3.0 - 3.0.68, 2.6.13.1 - 2.6.33.7, 3.14.72

linux_kernel (Debian package): 3.2.78-1 - 3.16.36-1+deb8u1

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External links
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=69c433ed2ecd2d3264efd7...

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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.