The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.
History

Wed, 14 Aug 2024 00:45:00 +0000

Type Values Removed Values Added
References

cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2021-04-17T04:20:16.706839Z

Updated: 2024-09-17T02:48:12.994Z

Reserved: 2021-04-12T00:00:00

Link: CVE-2021-3493

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-04-17T05:15:14.630

Modified: 2023-07-07T19:10:36.743

Link: CVE-2021-3493

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-04-16T00:00:00Z

Links: CVE-2021-3493 - Bugzilla