CVE-2023-52629
sh: push-switch: Reorder cleanup operations to avoid use-after-free bug
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sh: push-switch: reordenar las operaciones de limpieza para evitar el error de use after free. El código original coloca Flush_work() antes de timer_shutdown_sync() en switch_drv_remove(). Aunque usamos Flush_work() para detener al trabajador, podría reprogramarse en switch_timer(). Como resultado, puede ocurrir un error de use after free. Los detalles se muestran a continuación: (cpu 0) | (procesador 1) switch_drv_remove() | descarga_trabajo() | ... | switch_timer // temporizador | Schedule_work(&psw->trabajo) timer_shutdown_sync() | ... | switch_work_handler // trabajador kfree(psw) // gratis | | psw->state = 0 // uso Este parche coloca timer_shutdown_sync() antes de Flush_work() para mitigar los errores. Como resultado, el trabajador y el temporizador se detendrán de forma segura antes de las operaciones de desasignación.
CVSS Scores
SSVC
- Decision:Track*
Timeline
- 2024-03-06 CVE Reserved
- 2024-03-29 CVE Published
- 2024-03-30 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-416: Use After Free
CAPEC
References (3)
URL | Tag | Source |
---|---|---|
https://git.kernel.org/stable/c/9f5e8eee5cfe1328660c71812d87c2a67bda389f | Vuln. Introduced |
URL | Date | SRC |
---|
URL | Date | SRC |
---|---|---|
https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de | 2023-09-19 | |
https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65 | 2023-09-09 |
URL | Date | SRC |
---|
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.20 < 6.5.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.20 < 6.5.4" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.20 < 6.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.20 < 6.6" | en |
Affected
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