CVE Database›Document archive›CVE-2021-39698

CVE-2021-39698

kernel: use-after-free in the file polling implementation

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Severity

Important

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · March 7, 2022

Updated · November 22, 2025

Description

A vulnerability was found in the Linux kernel’s file polling implementation in kernel/sched/wait.c., which leads to a use-after-free problem. This flaw allows a local user to cause a denial of service (memory corruption or crash) or privilege escalation.

Statement

There was no shipped kernel version that was seen affected by this problem.

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

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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-416 · Use After Free