Vulnerability identifier: #VU9082

Vulnerability risk: Low

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

CVE-ID: CVE-2017-12193

CWE-ID: CWE-476

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 in the assoc_array implementation in which a new leaf is added that needs to go into a node that happens to be full. A local user can trigger NULL pointer dereference error and crash the kernel.

Mitigation
Update to 4.13.11, 4.9.60, 4.4.96 or 4.1.46.

Vulnerable software versions

Linux kernel: 4.13 - 4.13.10, 4.9.50 - 4.9.59, 4.4.90 - 4.4.95, 4.1.40 - 4.1.45

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External links
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.11
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.96
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.46
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.60

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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.