CVE-2022-50305

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

ASoC: sof_es8336: fix possible use-after-free in sof_es8336_remove()

sof_es8336_remove() calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This means that the callback function may still be running after the drivers remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that the work is properly cancelled, no longer running, and unable to re-schedule itself.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/1b41beaa7a58467505ec3023af8aad74f878b888
• https://git.kernel.org/stable/c/390a1a98288a53b2e7555097d83c6e55d579b166
• https://git.kernel.org/stable/c/b85102a3aa3810a09eb55692e8cd6ffbb304e57d