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Description

A container privilege escalation flaw was found in certain Fuse images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.

PUBLISHED Reserved 2025-08-21 | Published 2026-03-13 | Updated 2026-03-13 | Assigner redhat




MEDIUM: 6.4CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem types

Incorrect Default Permissions

Product status

Default status
unknown

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unknown

Timeline

2025-08-26:Reported to Red Hat.
2026-03-13:Made public.

Credits

Red Hat would like to thank Antony Di Scala and Michael Whale for reporting this issue.

References

access.redhat.com/security/cve/CVE-2025-57849 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2391100 (RHBZ#2391100) issue-tracking

cve.org (CVE-2025-57849)

nvd.nist.gov (CVE-2025-57849)

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