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Tracker / CVE-2024-39495

CVE-2024-39495

Alta 7.8

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 | gb_interface_create | gb_interface_request_mode_switch gb_interface_release | kfree(intf) (free) | | gb_interface_mode_switch_work | mutex_lock(&intf->mutex) (use) Fix it by canceling the work before kfree.

Prodotti e versioni affette

linux linux_kernel · … → 5.4.279
linux linux_kernel · 5.11 → 5.15.162
linux linux_kernel · 5.16 → 6.1.95
linux linux_kernel · 5.5 → 5.10.221
linux linux_kernel · 6.2 → 6.6.35
linux linux_kernel · 6.7 → 6.9.6

Analisi

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Riferimenti