阿里云漏洞库

CVE编号

CVE-2021-47195

利用情况

暂无

补丁情况

官方补丁

披露时间

2024-04-11

In the Linux kernel, the following vulnerability has been resolved:

spi: fix use-after-free of the add_lock mutex

Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on

SPI buses") introduced a per-controller mutex. But mutex_unlock() of

said lock is called after the controller is already freed:

spi_unregister_controller(ctlr)

-> put_device(&ctlr->dev)

-> spi_controller_release(dev)

-> mutex_unlock(&ctrl->add_lock)

Move the put_device() after the mutex_unlock().

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d
https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434

CWE-ID	漏洞类型
CWE-416	释放后使用