Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9f5e8eee5cfe1328660c71812d87c2a67bda389f before ff635d1f143b55fa005e9e43b16e6d8f677e90a5; affected 9f5e8eee5cfe1328660c71812d87c2a67bda389f before 610dbd8ac271aa36080aac50b928d700ee3fe4de; affected 9f5e8eee5cfe1328660c71812d87c2a67bda389f before 246f80a0b17f8f582b2c0996db02998239057c65 |
| Linux / Linux | affected 2.6.20; unaffected 0 before 2.6.20; unaffected 6.1.189 through 6.1.*; unaffected 6.5.4 through 6.5.*; unaffected 6.6 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ff635d1f143b55fa005e9e43b16e6d8f677e90a5
- https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
- https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.