CVE-2023-53459: HID: mcp-2221: prevent UAF in delayed work

Severity: high (CVSS 7.8 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: 2025-10-01 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: HID: mcp-2221: prevent UAF in delayed work If the device is plugged/unplugged without giving time for mcp_init_work() to complete, we might kick in the devm free code path and thus have unavailable struct mcp_2221 while in delayed work. Canceling the delayed_work item is enough to solve the issue, because cancel_delayed_work_sync will prevent the work item to requeue itself.

Affected products

Linux kernel: 6.2

References

https://git.kernel.org/stable/c/47e91fdfa511139f2549687edb0d8649b123227b
https://git.kernel.org/stable/c/5dc297652dbc557eba7ca7d6a4c5f1940dffffb1

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