CVE-2024-39495 In the Linux kernel, the following vulnerability has been resolved: greybus: Fix use-after-free bug in…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.10 | earliest → < 6.10 | 6.10 |
| Linux 6.9 | earliest → < 6.9.6 | 6.9.6 |
| Linux 6.6 | earliest → < 6.6.35 | 6.6.35 |
| Linux 6.1 | earliest → < 6.1.95 | 6.1.95 |
| Linux 5.15 | earliest → < 5.15.162 | 5.15.162 |
| Linux 5.10 | earliest → < 5.10.221 | 5.10.221 |
| Linux 5.4 | earliest → < 5.4.279 | 5.4.279 |
| Linux | 4.9 | No fix stated |
| linux_kernel | Versions not published |
References
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
- git.kernel.org git.kernel.org
Timeline
- Published
- Last modified