CVE-2021-37159

medium

Description

hso_free_net_device in drivers/net/usb/hso.c in the Linux kernel through 5.13.4 calls unregister_netdev without checking for the NETREG_REGISTERED state, leading to a use-after-free and a double free.

References

Advisories
More

https://www.spinics.net/lists/linux-usb/msg202228.html

https://www.oracle.com/security-alerts/cpujul2022.html

https://security.netapp.com/advisory/ntap-20210819-0003/

https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html

https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dcb713d53e2eadf42b878c12a471e74dc6ed3145

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a6ecfb39ba9d7316057cea823b196b734f6b18ca

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-23733

https://bugzilla.suse.com/show_bug.cgi?id=1188601

Details

Source: Mitre, NVD

Published: 2021-07-21

Updated: 2026-10-08

Risk Information

CVSS v2

Base Score: 4.4

Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 6.4

Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H