CVE-2023-52629: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug
First published: Fri Mar 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.106-3<=6.1.112-1 | 6.11.4-1 6.11.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
- https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
- https://launchpad.net/bugs/cve/CVE-2023-52629
- https://git.kernel.org/linus/246f80a0b17f8f582b2c0996db02998239057c65
- https://security-tracker.debian.org/tracker/CVE-2023-52629
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52629
- https://nvd.nist.gov/vuln/detail/CVE-2023-52629
- https://ubuntu.com/security/CVE-2023-52629
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