Bug 2509242

Summary:	CVE-2026-52791 fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation [fedora-all]
Product:	[Fedora] Fedora	Reporter:	jkelly <jkelly>
Component:	fuse-overlayfs	Assignee:	Lokesh Mandvekar <lsm5>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	container-sig, fedora, gscrivan, lsm5
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["bfea971a-419d-4df7-bce3-eaadfeb6a720"]}
Fixed In Version:	fuse-overlayfs-1.17-1.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-01 00:54:19 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2508489

Description jkelly 2026-07-30 10:45:55 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in fuse-overlayfs, a component used for rootless containers. This vulnerability allows a low-privileged process to retain SUID (Set User ID) and SGID (Set Group ID) permissions on files after they are truncated or opened with the O_TRUNC flag. This can enable a local attacker to manipulate file permissions, potentially leading to privilege escalation within the system.

Comment 1 Fedora Update System 2026-07-30 15:03:28 UTC

FEDORA-2026-4e0490640f (fuse-overlayfs-1.17-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4e0490640f

Comment 2 Fedora Update System 2026-07-30 15:03:37 UTC

FEDORA-2026-40ce06e46e (fuse-overlayfs-1.17-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-40ce06e46e

Comment 3 Fedora Update System 2026-07-31 01:44:24 UTC

FEDORA-2026-40ce06e46e has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-40ce06e46e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-40ce06e46e

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-31 01:57:32 UTC

FEDORA-2026-4e0490640f has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-4e0490640f`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4e0490640f

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-08-01 00:54:19 UTC

FEDORA-2026-4e0490640f (fuse-overlayfs-1.17-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.