Vulnerability identifier: #VU14185

Vulnerability risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14609

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 attacker to cause DoS condition on the target system.

The vulnerability exists in the __del_reloc_root() function, as defined in the fs/btrfs/relocation.c source code file of the affected software due to an invalid pointer dereference condition that could occur when a corrupted Btrfs filesystem image is mounted. A local attacker can mount a Btrfs image that submits malicious input, trigger an invalid pointer dereference condition and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.17 - 4.17.10, 4.16 - 4.16.18, 4.15 - 4.15.18

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External links
http://bugzilla.kernel.org/show_bug.cgi?id=199833

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