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CVE-2021-47461

kernel: userfaultfd: fix a race between writeprotect and exit_mmap()

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · May 22, 2024

Updated · November 2, 2026

Description

A possible race condition flaw was found in the Linux kernel. When a process exits, its virtual memory areas (VMAs) are removed by exit_mmap(), and at the same time, userfaultfd_writeprotect() is called.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization