CVE-2026-68152

Summary

In the Linux kernel, the following vulnerability has been resolved:

amt: fix use-after-free in AMT delayed works

When an AMT device is removed, pending delayed works can still access the freed amt_dev structure, which may result in kernel crashes or memory corruption.

amt_dev_stop() cancels req_wq and discovery_wq with cancel_delayed_work_sync(), but these works can be scheduled again from event_wq after the cancellation. This allows delayed works to access the freed amt_dev structure after the netdev has been released.

The following is a simple race scenario:

CPU0 CPU1

amt_dev_stop() cancel_delayed_work_sync() amt_event_work() mod_delayed_work(req_wq) free netdev req_wq accesses freed amt_dev

Use disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and discovery_wq from being queued again and wait for running work items to complete.

The delayed works are disabled after initialization in amt_newlink() and enabled only when the device is successfully opened. This keeps the delayed work lifecycle synchronized with the lifetime of the AMT device.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2
• https://git.kernel.org/stable/c/1a644db2cf59f164cdf3c75995bab5aadc097528
• https://git.kernel.org/stable/c/006340cf06881b6ff49767d8b6f3c4f7b892670c
• https://git.kernel.org/stable/c/ea20c44935d6142daecfa9b39d635033a7553e1b

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