#VU90532 NULL pointer dereference in Linux kernel - CVE-2021-47559
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90532
Vulnerability risk: Low
CVSSv4.0: 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-2021-47559
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
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 smc_link_down_work() and smc_vlan_by_tcpsk() functions in net/smc/smc_core.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff
- https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1
- https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.83
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.6
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16