#VU90477 NULL pointer dereference in Linux kernel - CVE-2021-47269

Cybersecurity Help s.r.o.

Published: 2024-05-31 | Updated: 2025-05-14

Vulnerability identifier: #VU90477

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-2021-47269

CWE-ID: CWE-476

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 NULL pointer dereference within the dwc3_wIndex_to_dep() function in drivers/usb/dwc3/ep0.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, 4.4.0, 4.4.0-57, 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5, 4.4.6, 4.4.7, 4.4.8, 4.4.9, 4.4.10, 4.4.11, 4.4.12, 4.4.13, 4.4.14, 4.4.15, 4.4.16, 4.4.17, 4.4.18, 4.4.19, 4.4.20, 4.4.21, 4.4.22, 4.4.23, 4.4.24, 4.4.25, 4.4.26, 4.4.27, 4.4.28, 4.4.29, 4.4.30, 4.4.31, 4.4.32, 4.4.33, 4.4.34, 4.4.35, 4.4.36, 4.4.37, 4.4.38, 4.4.39, 4.4.40, 4.4.41, 4.4.42, 4.4.43, 4.4.44, 4.4.45, 4.4.46, 4.4.47, 4.4.48, 4.4.49, 4.4.50, 4.4.51, 4.4.52, 4.4.53, 4.4.54, 4.4.55, 4.4.56, 4.4.57, 4.4.58, 4.4.59, 4.4.60, 4.4.61, 4.4.62, 4.4.63, 4.4.64, 4.4.65, 4.4.66, 4.4.67, 4.4.68, 4.4.69, 4.4.70, 4.4.71, 4.4.72, 4.4.73, 4.4.74, 4.4.75, 4.4.76, 4.4.77, 4.4.78, 4.4.79, 4.4.80, 4.4.81, 4.4.82, 4.4.83, 4.4.84, 4.4.85, 4.4.86, 4.4.87, 4.4.88, 4.4.89, 4.4.90, 4.4.91, 4.4.92, 4.4.93, 4.4.94, 4.4.95, 4.4.96, 4.4.97, 4.4.98, 4.4.99, 4.4.100, 4.4.101, 4.4.102, 4.4.103, 4.4.104, 4.4.105, 4.4.106, 4.4.107, 4.4.108, 4.4.109, 4.4.110, 4.4.111, 4.4.112, 4.4.113, 4.4.114, 4.4.115, 4.4.116, 4.4.117, 4.4.118, 4.4.119, 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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.

Latest bulletins with this vulnerability

Multiple vulnerabilities in Dell Cloud Tiering Appliance

Multiple vulnerabilities in Dell Secure Connect Gateway

SUSE update for the Linux Kernel

openEuler 20.03 LTS SP4 update for kernel

openEuler 20.03 LTS SP1 update for kernel

SUSE update for the Linux Kernel