CVE-2021-47171: net: usb: fix memory leak in smsc75xx_bind

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-25 · updated 2026-06-17
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net: usb: fix memory leak in smsc75xx_bind Syzbot reported memory leak in smsc75xx_bind(). The problem was is non-freed memory in case of errors after memory allocation. backtrace: [<ffffffff84245b62>] kmalloc include/linux/slab.h:556 [inline] [<ffffffff84245b62>] kzalloc include/linux/slab.h:686 [inline] [<ffffffff84245b62>] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460 [<ffffffff82b5b2e6>] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728

Affected products

Linux kernel: from 2.6.34 before 4.4.271; from 4.5 before 4.9.271; from 4.10 before 4.14.235; from 4.15 before 4.19.193; from 4.20 before 5.4.124; from 5.5 before 5.10.42 — fixed in 4.14.235, 4.19.193, 4.4.271, 4.9.271, 5.10.42, 5.12.9

How to fix

Upgrade to a fixed version: Linux kernel 4.14.235, 4.19.193, 4.4.271, 4.9.271. Check the vendor advisory for mitigations.

References

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