#VU6659 Denial of service in Linux kernel - CVE-2017-7645

Vulnerability identifier: #VU6659

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-7645

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to a flaw in the NFSv2/NFSv3 server in the nfsd subsystem. A remote attacker can use a long RPC reply related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 4.10.12.

Vulnerable software versions

Linux kernel: 4.0.1 - 4.0.9, 4.1.1 - 4.10.11, 4.2.0 - 4.2.8, 4.3.1 - 4.3.6, 4.4.0 - 4.4.75, 4.5.0 - 4.5.7, 4.6.0 - 4.6.7, 4.7.0 - 4.7.10, 4.8.0 - 4.8.17, 4.9.1 - 4.9.35

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e6838a29ecb484c97e4efe...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.