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GHSA-384v-9gx5-rmx4

GitHub Security Advisory

⚠ Unreviewed HIGH Has CVE

Advisory Details

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.

Related CVEs

Key Information

GHSA ID
GHSA-384v-9gx5-rmx4
Published
March 29, 2024 12:30 PM
Last Modified
August 1, 2024 3:31 PM
CVSS Score
7.5 /10
Primary Ecosystem
Unknown
Primary Package
Unknown
GitHub Reviewed
✗ No

Dataset

Last updated: August 1, 2025 6:44 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.