Description
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 products
linux: linux kernel
References5
- git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65 Patch
- git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de Patch
- git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65 Patch
- git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de Patch
- git.kernel.org/stable/c/ff635d1f143b55fa005e9e43b16e6d8f677e90a5
Metrics
- CVSS 3.1
-
8.4
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 17 · as of 5 November 2026
- CWE
- CWE-416
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