CVE-2024-39495 — greybus: Fix use-after-free bug in gb_interface_release due to race condition.

Affected: Linux, linux_kernel

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

greybus: Fix use-after-free bug in gb_interface_release due to race condition.

In gb_interface_create, &intf->mode_switch_completion is bound with gb_interface_mode_switch_work. Then it will be started by gb_interface_request_mode_switch. Here is the relevant code. if (!queue_work(system_long_wq, &intf->mode_switch_work)) { ... }

If we call gb_interface_release to make cleanup, there may be an unfinished work. This function will call kfree to free the object "intf". However, if gb_interface_mode_switch_work is scheduled to run after kfree, it may cause use-after-free error as gb_interface_mode_switch_work will use the object "intf". The possible execution flow that may lead to the issue is as follows:

CPU0 CPU1

Fix it by canceling the work before kfree.

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CVE-2024-39495 — greybus: Fix use-after-free bug in gb_interface_release due to race condition.