#VU93745 Improper resource shutdown or release in Linux kernel - CVE-2021-47452

Vulnerability identifier: #VU93745

Vulnerability risk: Low

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

CVE-ID: CVE-2021-47452

CWE-ID: CWE-404

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 perform a denial of service (DoS) attack.

The vulnerability exists due to failure to properly release resources within the nft_netdev_event() and nf_tables_netdev_event() functions in net/netfilter/nft_chain_filter.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.14, 5.14 rc1, 5.14 rc2, 5.14 rc3, 5.14 rc4, 5.14 rc7, 5.14.0-49.el9, 5.14.1, 5.14.2, 5.14.3, 5.14.4, 5.14.5, 5.14.6, 5.14.7, 5.14.8, 5.14.9, 5.14.10, 5.14.11, 5.14.12, 5.14.13, 5.14.14, 5.15 rc1, 5.15 rc2, 5.15 rc3, 5.15 rc4, 5.15 rc5, 5.15 rc6, 5.15 rc7

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External links
https://git.kernel.org/stable/c/90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f
https://git.kernel.org/stable/c/68a3765c659f809dcaac20030853a054646eb739
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15

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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.