Vulnerability identifier: #VU63383

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38208

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the net/nfc/llcp_sock.c component. A remote attacker can make getsockname call and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.12 - 5.12.4

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External links
http://github.com/torvalds/linux/commit/4ac06a1e013cf5fdd963317ffd3b968560f33bba
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.10
http://www.openwall.com/lists/oss-security/2021/08/17/1
http://www.openwall.com/lists/oss-security/2021/08/17/2
http://bugzilla.redhat.com/show_bug.cgi?id=1992810
http://www.openwall.com/lists/oss-security/2021/08/24/2

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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