Security Advisory

CVE-2021-47461

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2024-05-22 06:23:22

Last updated 2026-05-11 13:55:10

Assigner Linux

State PUBLISHED

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 by exit_mmap() and at the same time userfaultfd_writeprotect() is called. The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well. Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.

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