#VU90133 Use-after-free in Linux kernel - CVE-2021-47355

Cybersecurity Help s.r.o.

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

Vulnerability identifier: #VU90133

Vulnerability 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-2021-47355

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the nicstar_cleanup() function in drivers/atm/nicstar.c. A local user can escalate privileges on the system.

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, 4.4.120, 4.4.121, 4.4.122, 4.4.123, 4.4.124, 4.4.125, 4.4.126, 4.4.127, 4.4.128, 4.4.129, 4.4.130, 4.4.131, 4.4.132, 4.4.133, 4.4.134, 4.4.135, 4.4.136, 4.4.137, 4.4.138, 4.4.139, 4.4.140, 4.4.141, 4.4.142, 4.4.143, 4.4.144, 4.4.145, 4.4.146, 4.4.147, 4.4.148, 4.4.149, 4.4.150, 4.4.151, 4.4.152, 4.4.153, 4.4.154, 4.4.155, 4.4.156, 4.4.157, 4.4.158, 4.4.159, 4.4.160, 4.4.161, 4.4.162, 4.4.163, 4.4.164, 4.4.165, 4.4.166, 4.4.167, 4.4.168, 4.4.169, 4.4.170, 4.4.171, 4.4.172, 4.4.173, 4.4.174, 4.4.175, 4.4.176, 4.4.177, 4.4.178, 4.4.179, 4.4.180, 4.4.181, 4.4.182, 4.4.183, 4.4.184, 4.4.185, 4.4.186, 4.4.187, 4.4.188, 4.4.189, 4.4.190, 4.4.191, 4.4.192, 4.4.193, 4.4.194, 4.4.195, 4.4.196, 4.4.197, 4.4.198, 4.4.199, 4.4.200, 4.4.201, 4.4.202, 4.4.203, 4.4.204, 4.4.205, 4.4.206, 4.4.207, 4.4.208, 4.4.209, 4.4.210, 4.4.211, 4.4.212, 4.4.213, 4.4.214, 4.4.215, 4.4.216, 4.4.217, 4.4.218, 4.4.219, 4.4.220, 4.4.221, 4.4.222, 4.4.223, 4.4.224, 4.4.225, 4.4.226, 4.4.227, 4.4.228, 4.4.229, 4.4.230, 4.4.231, 4.4.232, 4.4.233, 4.4.234, 4.4.235, 4.4.236, 4.4.237, 4.4.238, 4.4.239, 4.4.240, 4.4.241, 4.4.242, 4.4.243, 4.4.244, 4.4.245, 4.4.246, 4.4.247, 4.4.248, 4.4.249, 4.4.250, 4.4.251, 4.4.252, 4.4.253, 4.4.254, 4.4.255, 4.4.256, 4.4.257, 4.4.258, 4.4.259, 4.4.260, 4.4.261, 4.4.262, 4.4.263, 4.4.264, 4.4.265, 4.4.266, 4.4.267, 4.4.268, 4.4.269, 4.4.270, 4.4.271, 4.4.272, 4.4.273, 4.4.274, 4.4.275, 4.9, 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.9.9, 4.9.10, 4.9.11, 4.9.12, 4.9.13, 4.9.14, 4.9.15, 4.9.16, 4.9.17, 4.9.18, 4.9.19, 4.9.20, 4.9.21, 4.9.22, 4.9.23, 4.9.24, 4.9.25, 4.9.26, 4.9.27, 4.9.28, 4.9.29, 4.9.30, 4.9.31, 4.9.32, 4.9.33, 4.9.34, 4.9.35, 4.9.36, 4.9.37, 4.9.38, 4.9.39, 4.9.40, 4.9.41, 4.9.42, 4.9.43, 4.9.44, 4.9.45, 4.9.46, 4.9.47, 4.9.48, 4.9.49, 4.9.50, 4.9.51, 4.9.52, 4.9.53, 4.9.54, 4.9.55, 4.9.56, 4.9.57, 4.9.58, 4.9.59, 4.9.60, 4.9.61, 4.9.62, 4.9.63, 4.9.64, 4.9.65, 4.9.66, 4.9.67, 4.9.68, 4.9.69, 4.9.70, 4.9.71, 4.9.72, 4.9.73, 4.9.74, 4.9.75, 4.9.76, 4.9.77, 4.9.78, 4.9.79, 4.9.80, 4.9.81, 4.9.82, 4.9.83, 4.9.84, 4.9.85, 4.9.86, 4.9.87, 4.9.88, 4.9.89, 4.9.90, 4.9.91, 4.9.92, 4.9.93, 4.9.94, 4.9.95, 4.9.96, 4.9.97, 4.9.98, 4.9.99, 4.9.100, 4.9.101, 4.9.102, 4.9.103, 4.9.104, 4.9.105, 4.9.106, 4.9.107, 4.9.108, 4.9.109, 4.9.110, 4.9.111, 4.9.112, 4.9.113, 4.9.114, 4.9.115, 4.9.116, 4.9.117, 4.9.118, 4.9.119, 4.9.120, 4.9.121, 4.9.122, 4.9.123, 4.9.124, 4.9.125, 4.9.126, 4.9.127, 4.9.128, 4.9.129, 4.9.130, 4.9.131, 4.9.132, 4.9.133, 4.9.134, 4.9.135, 4.9.136, 4.9.137, 4.9.138, 4.9.139, 4.9.140, 4.9.141, 4.9.142, 4.9.143, 4.9.144, 4.9.145, 4.9.146, 4.9.147, 4.9.148, 4.9.149, 4.9.150, 4.9.151, 4.9.152, 4.9.153, 4.9.154, 4.9.155, 4.9.156, 4.9.157, 4.9.158, 4.9.159, 4.9.160, 4.9.161, 4.9.162, 4.9.163, 4.9.164, 4.9.165, 4.9.166, 4.9.167, 4.9.168, 4.9.169, 4.9.170, 4.9.171, 4.9.172, 4.9.173, 4.9.174, 4.9.175, 4.9.176, 4.9.177, 4.9.178, 4.9.179, 4.9.180, 4.9.181, 4.9.182, 4.9.183, 4.9.184, 4.9.185, 4.9.186, 4.9.187, 4.9.188, 4.9.189, 4.9.190, 4.9.191, 4.9.192, 4.9.193, 4.9.194, 4.9.195, 4.9.196, 4.9.197, 4.9.198, 4.9.199, 4.9.200, 4.9.201, 4.9.202, 4.9.203, 4.9.204, 4.9.205, 4.9.206, 4.9.207, 4.9.208, 4.9.209, 4.9.210, 4.9.210-1, 4.9.211, 4.9.212, 4.9.213, 4.9.214, 4.9.215, 4.9.216, 4.9.217, 4.9.218, 4.9.219, 4.9.220, 4.9.221, 4.9.222, 4.9.223, 4.9.224, 4.9.225, 4.9.226, 4.9.227, 4.9.228, 4.9.229, 4.9.230, 4.9.231, 4.9.232, 4.9.233, 4.9.234, 4.9.235, 4.9.236, 4.9.237, 4.9.238, 4.9.239, 4.9.240, 4.9.241, 4.9.242, 4.9.243, 4.9.244, 4.9.245, 4.9.246, 4.9.247, 4.9.248, 4.9.249, 4.9.250, 4.9.251, 4.9.252, 4.9.253, 4.9.254, 4.9.255, 4.9.256, 4.9.257, 4.9.258, 4.9.259, 4.9.260, 4.9.261, 4.9.262, 4.9.263, 4.9.264, 4.9.265, 4.9.266, 4.9.267, 4.9.268, 4.9.269, 4.9.270, 4.9.271, 4.9.272, 4.9.273, 4.9.274, 4.9.275, 4.14, 4.14.0, 4.14.0 rc1, 4.14.1, 4.14.2, 4.14.3, 4.14.4, 4.14.5, 4.14.6, 4.14.7, 4.14.8, 4.14.9, 4.14.10, 4.14.11, 4.14.12, 4.14.13, 4.14.14, 4.14.15, 4.14.16, 4.14.17, 4.14.18, 4.14.19, 4.14.20, 4.14.21, 4.14.22, 4.14.23, 4.14.24, 4.14.25, 4.14.26, 4.14.27, 4.14.28, 4.14.29, 4.14.30, 4.14.31, 4.14.32, 4.14.33, 4.14.34, 4.14.35, 4.14.36, 4.14.37, 4.14.38, 4.14.39, 4.14.40, 4.14.41, 4.14.42, 4.14.43, 4.14.44, 4.14.45, 4.14.46, 4.14.47, 4.14.48, 4.14.49, 4.14.50, 4.14.51, 4.14.52, 4.14.53, 4.14.54, 4.14.55, 4.14.56, 4.14.57, 4.14.58, 4.14.59, 4.14.60, 4.14.61, 4.14.62, 4.14.63, 4.14.64, 4.14.65, 4.14.66, 4.14.67, 4.14.68, 4.14.69, 4.14.70, 4.14.71, 4.14.72, 4.14.73, 4.14.74, 4.14.75, 4.14.76, 4.14.77, 4.14.78, 4.14.79, 4.14.80, 4.14.81, 4.14.82, 4.14.83, 4.14.84, 4.14.85, 4.14.86, 4.14.87, 4.14.88, 4.14.89, 4.14.90, 4.14.91, 4.14.92, 4.14.93, 4.14.94, 4.14.95, 4.14.96, 4.14.97, 4.14.98, 4.14.99, 4.14.100, 4.14.101, 4.14.102, 4.14.103, 4.14.104, 4.14.105, 4.14.106, 4.14.107, 4.14.108, 4.14.109, 4.14.110, 4.14.111, 4.14.112, 4.14.113, 4.14.114, 4.14.115, 4.14.116, 4.14.117, 4.14.118, 4.14.119, 4.14.120, 4.14.121, 4.14.122, 4.14.123, 4.14.124, 4.14.125, 4.14.126, 4.14.127, 4.14.128, 4.14.129, 4.14.130, 4.14.131, 4.14.132, 4.14.133, 4.14.134, 4.14.135, 4.14.136, 4.14.137, 4.14.138, 4.14.139, 4.14.140, 4.14.141, 4.14.142, 4.14.143, 4.14.144, 4.14.145, 4.14.146, 4.14.147, 4.14.148, 4.14.149, 4.14.150, 4.14.151, 4.14.152, 4.14.153, 4.14.154, 4.14.155, 4.14.156, 4.14.157, 4.14.158, 4.14.159, 4.14.160, 4.14.161, 4.14.162, 4.14.163, 4.14.164, 4.14.165, 4.14.166, 4.14.167, 4.14.168, 4.14.169, 4.14.170, 4.14.171, 4.14.172, 4.14.173, 4.14.174, 4.14.175, 4.14.176, 4.14.177, 4.14.178, 4.14.179, 4.14.180, 4.14.181, 4.14.182, 4.14.183, 4.14.184, 4.14.185, 4.14.186, 4.14.187, 4.14.188, 4.14.189, 4.14.190, 4.14.191, 4.14.192, 4.14.193, 4.14.194, 4.14.195, 4.14.196, 4.14.197, 4.14.198, 4.14.199, 4.14.200, 4.14.201, 4.14.202, 4.14.203, 4.14.204, 4.14.205, 4.14.206, 4.14.207, 4.14.208, 4.14.209, 4.14.210, 4.14.211, 4.14.212, 4.14.213, 4.14.214, 4.14.215, 4.14.216, 4.14.217, 4.14.218, 4.14.219, 4.14.220, 4.14.221, 4.14.222, 4.14.223, 4.14.224, 4.14.225, 4.14.226, 4.14.227, 4.14.228, 4.14.229, 4.14.230, 4.14.231, 4.14.232, 4.14.233, 4.14.234, 4.14.235, 4.14.236, 4.14.237, 4.14.238, 4.14.239, 4.19, 4.19.1, 4.19.2, 4.19.3, 4.19.4, 4.19.5, 4.19.6, 4.19.7, 4.19.8, 4.19.9, 4.19.10, 4.19.11, 4.19.12, 4.19.13, 4.19.14, 4.19.15, 4.19.16, 4.19.17, 4.19.18, 4.19.19, 4.19.20, 4.19.21, 4.19.22, 4.19.23, 4.19.24, 4.19.25, 4.19.26, 4.19.27, 4.19.28, 4.19.29, 4.19.30, 4.19.31, 4.19.32, 4.19.33, 4.19.34, 4.19.35, 4.19.36, 4.19.37, 4.19.38, 4.19.39, 4.19.40, 4.19.41, 4.19.42, 4.19.43, 4.19.44, 4.19.45, 4.19.46, 4.19.47, 4.19.48, 4.19.49, 4.19.50, 4.19.51, 4.19.52, 4.19.53, 4.19.54, 4.19.55, 4.19.56, 4.19.57, 4.19.58, 4.19.59, 4.19.60, 4.19.61, 4.19.62, 4.19.63, 4.19.64, 4.19.65, 4.19.66, 4.19.67, 4.19.68, 4.19.69, 4.19.70, 4.19.71, 4.19.72, 4.19.73, 4.19.74, 4.19.75, 4.19.76, 4.19.77, 4.19.78, 4.19.79, 4.19.80, 4.19.81, 4.19.82, 4.19.83, 4.19.84, 4.19.85, 4.19.86, 4.19.87, 4.19.88, 4.19.89, 4.19.90, 4.19.91, 4.19.92, 4.19.93, 4.19.94, 4.19.95, 4.19.96, 4.19.97, 4.19.98, 4.19.99, 4.19.100, 4.19.101, 4.19.102, 4.19.103, 4.19.104, 4.19.105, 4.19.106, 4.19.107, 4.19.108, 4.19.109, 4.19.110, 4.19.111, 4.19.112, 4.19.113, 4.19.114, 4.19.115, 4.19.116, 4.19.117, 4.19.118, 4.19.118-2, 4.19.119, 4.19.120, 4.19.121, 4.19.122, 4.19.123, 4.19.124, 4.19.125, 4.19.126, 4.19.127, 4.19.128, 4.19.129, 4.19.130, 4.19.131, 4.19.132, 4.19.133, 4.19.134, 4.19.135, 4.19.136, 4.19.137, 4.19.138, 4.19.139, 4.19.140, 4.19.141, 4.19.142, 4.19.143, 4.19.144, 4.19.145, 4.19.146, 4.19.147, 4.19.148, 4.19.149, 4.19.150, 4.19.151, 4.19.152, 4.19.153, 4.19.154, 4.19.155, 4.19.156, 4.19.157, 4.19.158, 4.19.159, 4.19.160, 4.19.161, 4.19.162, 4.19.163, 4.19.164, 4.19.165, 4.19.166, 4.19.167, 4.19.168, 4.19.169, 4.19.170, 4.19.171, 4.19.172, 4.19.173, 4.19.174, 4.19.175, 4.19.176, 4.19.177, 4.19.178, 4.19.179, 4.19.180, 4.19.181, 4.19.182, 4.19.183, 4.19.184, 4.19.185, 4.19.186, 4.19.187, 4.19.188, 4.19.189, 4.19.190, 4.19.191, 4.19.192, 4.19.193, 4.19.194, 4.19.195, 4.19.196, 4.19.197, 5.4, 5.4.0, 5.4.0 rc6, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.4.10, 5.4.11, 5.4.12, 5.4.13, 5.4.14, 5.4.15, 5.4.16, 5.4.17, 5.4.18, 5.4.19, 5.4.20, 5.4.21, 5.4.22, 5.4.23, 5.4.24, 5.4.25, 5.4.26, 5.4.27, 5.4.28, 5.4.29, 5.4.30, 5.4.31, 5.4.32, 5.4.33, 5.4.34, 5.4.35, 5.4.36, 5.4.37, 5.4.38, 5.4.39, 5.4.40, 5.4.41, 5.4.42, 5.4.43, 5.4.44, 5.4.45, 5.4.46, 5.4.47, 5.4.48, 5.4.49, 5.4.50, 5.4.51, 5.4.52, 5.4.53, 5.4.54, 5.4.55, 5.4.56, 5.4.57, 5.4.58, 5.4.59, 5.4.60, 5.4.61, 5.4.62, 5.4.63, 5.4.64, 5.4.65, 5.4.66, 5.4.67, 5.4.68, 5.4.69, 5.4.70, 5.4.71, 5.4.72, 5.4.73, 5.4.74, 5.4.75, 5.4.76, 5.4.77, 5.4.78, 5.4.79, 5.4.80, 5.4.81, 5.4.82, 5.4.83, 5.4.84, 5.4.85, 5.4.86, 5.4.87, 5.4.88, 5.4.89, 5.4.90, 5.4.91, 5.4.92, 5.4.93, 5.4.94, 5.4.95, 5.4.96, 5.4.97, 5.4.98, 5.4.99, 5.4.100, 5.4.101, 5.4.102, 5.4.103, 5.4.104, 5.4.105, 5.4.106, 5.4.107, 5.4.108, 5.4.109, 5.4.110, 5.4.111, 5.4.112, 5.4.113, 5.4.114, 5.4.115, 5.4.116, 5.4.117, 5.4.118, 5.4.119, 5.4.120, 5.4.121, 5.4.122, 5.4.123, 5.4.124, 5.4.125, 5.4.126, 5.4.127, 5.4.128, 5.4.129, 5.4.130, 5.4.131, 5.4.132, 5.10, 5.10 rc1, 5.10 rc2, 5.10 rc3, 5.10 rc4, 5.10 rc5, 5.10 rc7, 5.10.1, 5.10.2, 5.10.3, 5.10.4, 5.10.5, 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, 5.12, 5.12 rc1, 5.12 rc2, 5.12 rc3, 5.12 rc4, 5.12 rc6, 5.12 rc8, 5.12.1, 5.12.2, 5.12.3, 5.12.4, 5.12.5, 5.12.6, 5.12.7, 5.12.8, 5.12.9, 5.12.10, 5.12.11, 5.12.12, 5.12.13, 5.12.14, 5.12.15, 5.12.16, 5.12.17, 5.13, 5.13 rc1, 5.13 rc4, 5.13 rc5, 5.13.1, 5.13.2, 5.14 rc1, 5.14 rc2, 5.14 rc3, 5.14 rc4, 5.14 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 Secure Connect Gateway

SUSE update for the Linux Kernel

openEuler 20.03 LTS SP4 update for kernel

Use-after-free in Linux kernel atm driver