CVE-2021-47404: HID: betop: fix slab-out-of-bounds Write in betop_probe

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-06-17
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: HID: betop: fix slab-out-of-bounds Write in betop_probe Syzbot reported slab-out-of-bounds Write bug in hid-betopff driver. The problem is the driver assumes the device must have an input report but some malicious devices violate this assumption. So this patch checks hid_device's input is non empty before it's been used.

Affected products

Linux kernel: before 4.4.286; from 4.5 before 4.9.285; from 4.10 before 4.14.249; from 4.15 before 4.19.209; from 4.20 before 5.4.151; from 5.5 before 5.10.71 — fixed in 4.14.249, 4.19.209, 4.4.286, 4.9.285, 5.10.71, 5.14.10

How to fix

Upgrade to a fixed version: Linux kernel 4.14.249, 4.19.209, 4.4.286, 4.9.285. Check the vendor advisory for mitigations.

References

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