Bug 2494173

Summary:	CVE-2026-54370 acl: TOCTOU Symlink Traversal via getfacl/setfacl [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	acl	Assignee:	Lukáš Zaoral <lzaoral>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	jamartis, kdudka, lzaoral, pcahyna, steved, traffic.bpk
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["1af30249-b14a-4d59-8000-6b4da88a5482"]}
Fixed In Version:	acl-2.4.0-1.fc45 acl-2.4.0-1.fc44 acl-2.4.0-1.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-11 01:11:53 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:	2490279

Description Mauro Matteo Cascella 2026-06-29 13:16:39 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.

acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl or setfacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.

Comment 1 Lukáš Zaoral 2026-07-09 08:41:53 UTC

FEDORA-2026-a948378fff (acl-2.4.0-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-a948378fff

Comment 2 Fedora Update System 2026-07-09 08:50:35 UTC

FEDORA-2026-67504c329b (acl-2.4.0-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-67504c329b

Comment 3 Fedora Update System 2026-07-09 08:50:40 UTC

FEDORA-2026-6b9a652463 (acl-2.4.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-6b9a652463

Comment 4 Fedora Update System 2026-07-10 01:27:24 UTC

FEDORA-2026-6b9a652463 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-2026-6b9a652463`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6b9a652463

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

Comment 5 Fedora Update System 2026-07-10 01:43:59 UTC

FEDORA-2026-67504c329b 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-2026-67504c329b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-67504c329b

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

Comment 6 Fedora Update System 2026-07-11 01:11:53 UTC

FEDORA-2026-6b9a652463 (acl-2.4.0-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-07-13 01:04:00 UTC

FEDORA-2026-67504c329b (acl-2.4.0-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.