CVE-2021-3493

kernel: overlayfs file system caps privilege escalation

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Severity

Moderate

Red Hat Product Security

7.4

CVSS 3.1

Review impact separately from score.

Published · April 16, 2021

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel. The overlayfs stacking file system does not properly validate the application of file capabilities against user namespaces. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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 · 7.4
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-552 · Files or Directories Accessible to External Parties