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CVE-2023-52629

Disclosure Date: March 29, 2024
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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.

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General Information

Vendors

  • Linux

Products

  • Linux

Additional Info

Technical Analysis