Vulnerability identifier: #VU8693

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-14991

CWE-ID: CWE-401

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak in sg_ioctl() function in drivers/scsi/sg.c. A local user can obtain sensitive information from uninitialized kernel heap-memory locations via an SG_GET_REQUEST_TABLE ioctl call for /dev/sg0.

Mitigation
Update to version 4.13.4.

Vulnerable software versions

Linux kernel: 4.13 - 4.13.3

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External links
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3e0097499839e0fe3af380410e...
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.4 
http://github.com/torvalds/linux/commit/3e0097499839e0fe3af380410eababe5a47c4cf9

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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.