Improper locking in Linux kernel net driver

Published: 2024-06-20 | Updated: 2025-05-13

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2021-47574
CWE-ID	CWE-667
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Linux kernel Operating systems & Components / Operating system
Vendor	Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper locking

EUVDB-ID: #VU92358

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-2021-47574

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

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

The vulnerability exists due to improper locking within the xennet_open(), xennet_tx_buf_gc(), xennet_close(), xennet_get_extras(), xennet_fill_frags(), __skb_queue_tail(), xennet_set_features(), setup_netfront_single(), setup_netfront_split() and xennet_init_queue() functions in drivers/net/xen-netfront.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.16 rc8

CPE2.3

External links

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.