Use-after-free in Linux kernel rtl8712 driver



| Updated: 2025-05-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47479
CWE-ID CWE-416
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) Use-after-free

EUVDB-ID: #VU90059

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47479

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

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 r871xu_dev_remove() function in drivers/staging/rtl8712/usb_intf.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.10 - 5.16 rc8

CPE2.3 External links

https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506
https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed
https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4
https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.79
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.18
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.2
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16


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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