CVE-2021-47120

MEDIUM

Linux Kernel 4.20-5.4.125 - NULL Pointer Dereference in HID Magic Mouse Disconnect Handler

Title source: llm

Description

In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: fix NULL-deref on disconnect Commit 9d7b18668956 ("HID: magicmouse: add support for Apple Magic Trackpad 2") added a sanity check for an Apple trackpad but returned success instead of -ENODEV when the check failed. This means that the remove callback will dereference the never-initialised driver data pointer when the driver is later unbound (e.g. on USB disconnect).

References (4)

Core 4

Core References

Patch

https://git.kernel.org/stable/c/368c5d45a87e1bcc7f1e98e0c255c37b7b12c5d6

Patch

https://git.kernel.org/stable/c/b5d013c4c76b276890135b5d32803c4c63924b77

Patch

https://git.kernel.org/stable/c/9cf27473f21913a3eaf4702dd2a25415afd5f33f

Patch

https://git.kernel.org/stable/c/4b4f6cecca446abcb686c6e6c451d4f1ec1a7497

Scores

CVSS v3 5.5

EPSS 0.0024

EPSS Percentile 14.4%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (12)

Linux/Linux < 4.20

Linux/Linux 4.20

Linux/Linux 5.10.43 - 5.10.*

Linux/Linux 5.12.10 - 5.12.*

Linux/Linux 5.13

Linux/Linux 5.4.125 - 5.4.*

Linux/Linux 9d7b18668956c411a422d04c712994c5fdb23a4b - 368c5d45a87e1bcc7f1e98e0c255c37b7b12c5d6

Linux/Linux 9d7b18668956c411a422d04c712994c5fdb23a4b - 4b4f6cecca446abcb686c6e6c451d4f1ec1a7497

Linux/Linux 9d7b18668956c411a422d04c712994c5fdb23a4b - 9cf27473f21913a3eaf4702dd2a25415afd5f33f

Linux/Linux 9d7b18668956c411a422d04c712994c5fdb23a4b - b5d013c4c76b276890135b5d32803c4c63924b77

... and 2 more

Published Mar 15, 2024

Tracked Since Feb 18, 2026