UBUNTU-CVE-2023-52629
In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_remove(). Although we use flush_work() to stop the worker, it could be rescheduled in switch_timer(). As a result, a use-after-free bug can occur. The details are shown below: (cpu 0) | (cpu 1) switch_drv_remove() | flush_work() | ... | switch_timer // timer | schedule_work(&psw->work) timer_shutdown_sync() | ... | switch_work_handler // worker kfree(psw) // free | | psw->state = 0 // use This patch puts timer_shutdown_sync() before flush_work() to mitigate the bugs. As a result, the worker and timer will be stopped safely before the deallocate operations.
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_remove(). Although we use flush_work() to stop the worker, it could be rescheduled in switch_timer(). As a result, a use-after-free bug can occur. The details are shown below: (cpu 0) | (cpu 1) switch_drv_remove() | flush_work() | ... | switch_timer // timer | schedule_work(&psw->work) timer_shutdown_sync() | ... | switch_work_handler // worker kfree(psw) // free | | psw->state = 0 // use This patch puts timer_shutdown_sync() before flush_work() to mitigate the bugs. As a result, the worker and timer will be stopped safely before the deallocate operations.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/246f80a0b17f8f582b2c0996db02998239057c65
- https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
- https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
- https://ubuntu.com/security/CVE-2023-52629
- https://ubuntu.com/security/notices/USN-6972-1
- https://ubuntu.com/security/notices/USN-6972-2
- https://ubuntu.com/security/notices/USN-6972-3
- https://ubuntu.com/security/notices/USN-6972-4
- https://ubuntu.com/security/notices/USN-6973-1
- https://ubuntu.com/security/notices/USN-6973-2
- https://ubuntu.com/security/notices/USN-6973-3
- https://ubuntu.com/security/notices/USN-6973-4
- https://ubuntu.com/security/notices/USN-6974-1
- https://ubuntu.com/security/notices/USN-6974-2
- https://ubuntu.com/security/notices/USN-6976-1
- https://ubuntu.com/security/notices/USN-7006-1
- https://ubuntu.com/security/notices/USN-7019-1
- https://www.cve.org/CVERecord?id=CVE-2023-52629