Vulnerability identifier: #VU14201

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-2018-14612

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 btrfs_root_node() function due to insufficient validation of chunk block group mappings in the btrfs_read_block_groups() function (as defined in the fs/btrfs/extent-tree.c source code file of the affected software), as well as insufficient empty-tree checks in the check_leaf() function in the fs/btrfs/tree-checker.c source code file. A local attacker can mount a B-Tree File System (Btrfs) image that submits malicious input, trigger an invalid pointer dereference condition in the btrfs_root_node() function 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=199847

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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.