Use-after-free in Linux kernel usb peak_usb driver



| Updated: 2025-05-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47670
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: #VU107661

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-2021-47670

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 pcan_usb_fd_decode_canmsg() and pcan_usb_fd_decode_status() functions in drivers/net/can/usb/peak_usb/pcan_usb_fd.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.10 - 5.10.10

CPE2.3 External links

https://git.kernel.org/stable/c/50aca891d7a554db0901b245167cd653d73aaa71
https://git.kernel.org/stable/c/5408824636fa0dfedb9ecb0d94abd573131bfbbe
https://git.kernel.org/stable/c/ddd1416f44130377798c1430b76503513b7497c2
https://git.kernel.org/stable/c/ec939c13c3fff2114479769c8380b7f1a54feca9
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.11


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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