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High severity7.8NVD Advisory· Published May 22, 2024· Updated Aug 4, 2026

CVE-2021-47461

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 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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Affected products

108

Patches

Vulnerability mechanics

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