Vulnerability identifier: #VU8812

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-2017-1000255

CWE-ID: CWE-119

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 execute arbitrary code with escalated privileges.

The vulnerability exists due to a boundary error in the Linux kernel's when handling signal frame on PowerPC systems. A malicious local user process could craft a signal frame allowing an attacker to corrupt memory and execute arbitrary code on the target system with escalated privileges.

Mitigation
Update to Linux kernel 4.9.55 or 4.13.6.

Vulnerable software versions

Linux kernel: 4.9 - 4.9.54, 4.13 - 4.13.5

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External links
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.55
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.6

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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.