Vulnerability identifier: #VU90244

Vulnerability risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47061

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the kvm_io_bus_unregister_dev() function in virt/kvm/kvm_main.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/03c6cccedd3913006744faa252a4da5145299343
http://git.kernel.org/stable/c/4e899ca848636b37e9ac124bc1723862a7d7d927
http://git.kernel.org/stable/c/30f46c6993731efb2a690c9197c0fd9ed425da2d
http://git.kernel.org/stable/c/2ee3757424be7c1cd1d0bbfa6db29a7edd82a250

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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.