Vulnerability identifier: #VU63767

Vulnerability risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3752

CWE-ID: CWE-416

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the Linux kernel’s Bluetooth subsystem when a user calls connect to the socket and disconnect simultaneously. A local user can escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://lore.kernel.org/lkml/20211115165435.133245729@linuxfoundation.org/
http://www.openwall.com/lists/oss-security/2021/09/15/4
http://bugzilla.redhat.com/show_bug.cgi?id=1999544
http://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
http://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
http://www.debian.org/security/2022/dsa-5096
http://security.netapp.com/advisory/ntap-20220318-0009/

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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