What’s Vulnerable › Vulnerabilities

CVE-2021-47120: HID: magicmouse: fix NULL-deref on disconnect

• 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: 2024-03-15 · updated 2026-06-17
• Weakness: CWE-476

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).

Affected products

• Linux kernel: from 4.20 before 5.4.125; from 5.5 before 5.10.43; from 5.11 before 5.12.10; 5.13-rc1, 5.13-rc2, 5.13-rc3, 5.13-rc4 — fixed in 5.10.43, 5.12.10, 5.4.125

How to fix

Upgrade to a fixed version: Linux kernel 5.10.43, 5.12.10, 5.4.125. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/368c5d45a87e1bcc7f1e98e0c255c37b7b12c5d6
• https://git.kernel.org/stable/c/4b4f6cecca446abcb686c6e6c451d4f1ec1a7497
• https://git.kernel.org/stable/c/9cf27473f21913a3eaf4702dd2a25415afd5f33f
• https://git.kernel.org/stable/c/b5d013c4c76b276890135b5d32803c4c63924b77
• https://git.kernel.org/stable/c/368c5d45a87e1bcc7f1e98e0c255c37b7b12c5d6
• https://git.kernel.org/stable/c/4b4f6cecca446abcb686c6e6c451d4f1ec1a7497
• https://git.kernel.org/stable/c/9cf27473f21913a3eaf4702dd2a25415afd5f33f
• https://git.kernel.org/stable/c/b5d013c4c76b276890135b5d32803c4c63924b77

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