CVEs-PoC/2021/CVE-2021-47461.md

CVE-2021-47461

Description

In the Linux kernel, the following vulnerability has been resolved:userfaultfd: fix a race between writeprotect and exit_mmap()A race is possible when a process exits, its VMAs are removed byexit_mmap() and at the same time userfaultfd_writeprotect() is called.The race was detected by KASAN on a development kernel, but it appearsto be possible on vanilla kernels as well.Use mmget_not_zero() to prevent the race as done in other userfaultfdoperations.

POC

Reference

No PoCs from references.

Github

• https://github.com/fkie-cad/nvd-json-data-feeds