#VU87991 NULL pointer dereference in Linux kernel - CVE-2021-46905
Published: April 2, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU87991
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-2021-46905
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 a NULL pointer dereference error on disconnect regression within the hso_serial_tty_unregister() functin in drivers/net/usb/hso.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install updates from vendor's website.
External links
- https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725
- https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e
- https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273
- https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00
- https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef
- https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.232
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.189
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.268
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.268
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.33
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.17
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.1
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.115