Vulnerability identifier: #VU11264

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-2017-18241

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 weakness exists in the fs/f2fs/segment.c source code file due to the use of the noflush_merge option, which could trigger a NULL value for a flush_cmd_control data structure. A local attacker can trigger NULL pointer dereference and kernel panic and cause the service to crash.

Mitigation
Update to version 4.13 or later.

Vulnerable software versions

Linux kernel: 4.0.1 - 4.0.6, 4.1 - 4.1.5, 4.2 - 4.2.6, 4.3 - 4.3.6, 4.4.0 - 4.4.111, 4.6 rc1 - 4.6.3, 4.5 - 4.5.4, 4.7 - 4.7.9, 4.8 - 4.8.12, 4.9 - 4.9.76, 4.10.0 - 4.10.15, 4.11 - 4.11.5, 4.12 - 4.12.9

---

External links
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d4fdf8ba0e5808ba9ad6b4...

---

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.