#VU90930 Improper error handling in Linux kernel - CVE-2021-47482

Cybersecurity Help s.r.o.

Published: 2024-06-03 | Updated: 2025-05-14

Vulnerability identifier: #VU90930

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-2021-47482

CWE-ID: CWE-388

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 improper error handling within the batadv_tt_init() function in net/batman-adv/translation-table.c, within the batadv_nc_mesh_init() function in net/batman-adv/network-coding.c, within the batadv_mesh_init() function in net/batman-adv/main.c, within the batadv_bla_init() function in net/batman-adv/bridge_loop_avoidance.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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5.10.6, 5.10.7, 5.10.8, 5.10.9, 5.10.10, 5.10.11, 5.10.12, 5.10.13, 5.10.14, 5.10.15, 5.10.16, 5.10.17, 5.10.18, 5.10.19, 5.10.20, 5.10.21, 5.10.22, 5.10.23, 5.10.24, 5.10.25, 5.10.26, 5.10.27, 5.10.28, 5.10.29, 5.10.30, 5.10.31, 5.10.32, 5.10.33, 5.10.34, 5.10.35, 5.10.36, 5.10.37, 5.10.38, 5.10.39, 5.10.40, 5.10.41, 5.10.42, 5.10.43, 5.10.44, 5.10.45, 5.10.46, 5.10.47, 5.10.48, 5.10.49, 5.10.50, 5.10.51, 5.10.52, 5.10.53, 5.10.54, 5.10.55, 5.10.56, 5.10.57, 5.10.58, 5.10.59, 5.10.60, 5.10.61, 5.10.62, 5.10.63, 5.10.64, 5.10.65, 5.10.66, 5.10.67, 5.10.68, 5.10.69, 5.10.70, 5.10.71, 5.10.72, 5.10.73, 5.10.74, 5.10.75, 5.10.76, 5.14, 5.14 rc1, 5.14 rc2, 5.14 rc3, 5.14 rc4, 5.14 rc7, 5.14.0-49.el9, 5.14.1, 5.14.2, 5.14.3, 5.14.4, 5.14.5, 5.14.6, 5.14.7, 5.14.8, 5.14.9, 5.14.10, 5.14.11, 5.14.12, 5.14.13, 5.14.14, 5.14.15, 5.14.15-100.fc33, 5.14.15-200.fc34, 5.14.15-300.fc35, 5.15 rc1, 5.15 rc2, 5.15 rc3, 5.15 rc4, 5.15 rc5, 5.15 rc6, 5.15 rc7

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

SUSE update for the Linux Kernel

openEuler 20.03 LTS SP4 update for kernel