Improper privilege management in Linux kernel dma idxd driver



| Updated: 2025-05-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-46919
CWE-ID CWE-269
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 privilege management

EUVDB-ID: #VU93741

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-2021-46919

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

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

The vulnerability exists due to improperly imposed permissions within the wq_size_store() function in drivers/dma/idxd/sysfs.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.10 - 5.12 rc8

CPE2.3 External links

https://git.kernel.org/stable/c/4ecf25595273203010bc8318c4aee60ad64037ae
https://git.kernel.org/stable/c/05b7791c4c4aa8304368fdc55ae911f6b34e7281
https://git.kernel.org/stable/c/0fff71c5a311e1264988179f7dcc217fda15fadd
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.32
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.16
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12


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.



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