#VU92767 Incorrect default permissions in Linux kernel - CVE-2020-26088

Vulnerability identifier: #VU92767

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-26088

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a local user to manipulate data.

A missing CAP_NET_RAW check in NFC socket creation in net/nfc/rawsock.c in the Linux kernel before 5.8.2 could be used by local attackers to create raw sockets, bypassing security mechanisms, aka CID-26896f01467a.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

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External links
https://github.com/torvalds/linux/commit/26896f01467a28651f7a536143fe5ac8449d4041
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
https://usn.ubuntu.com/4578-1/
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html

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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.