Security restrictins bypass in Flatpak - CVE-2021-41133

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Main Vulnerability Database Vulnerabilities #VU57176

Security restrictins bypass in Flatpak - CVE-2021-41133

Published: October 8, 2021 / Updated: April 8, 2026


Vulnerability identifier: #VU57176
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-41133
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in the VFS-manipulating syscalls implementation. A local user can bypass sandbox restrictions and escalate privileges on the system.


Affected software

Flatpak
Gentoo Linux
Arch Linux
SUSE CaaS Platform
SUSE Enterprise Storage
CentOS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Module for Desktop Applications
Ubuntu
openEuler
Fedora
flatpak (Red Hat package)
flatpak (Debian package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
flatpak
flatpak-debuginfo
flatpak-debugsource
flatpak-devel
typelib-1_0-Flatpak-1_0
libflatpak0-debuginfo
libflatpak0
flatpak-help
flatpak (Ubuntu package)
libflatpak0 (Ubuntu package)
flatpak-zsh-completion
flatpak-libs
flatpak-session-helper
flatpak-selinux
system-user-flatpak
sys-apps/flatpak
webkit2gtk
wpewebkit

How to mitigate CVE-2021-41133

Install updates from vendor's website.

Flatpak - addressed in versions 1.10.5, 1.12.1
flatpak (Red Hat package) - addressed in versions 1.0.9-5.el8_1, 1.0.9-12.el7_9, 1.6.2-6.el8_2, 1.8.5-4.el8_4
flatpak (Debian package) - update to 1.10.5-0+deb11u1
flatpak - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
flatpak-debuginfo - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
flatpak-debugsource - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
flatpak-devel - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
typelib-1_0-Flatpak-1_0 - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
libflatpak0-debuginfo - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
libflatpak0 - addressed in versions 0.10.4-150000.4.13.1, 1.2.3-150100.4.8.1, 1.10.5-4.9.1
flatpak-help - update to 1.0.3-7
flatpak-debugsource - update to 1.0.3-7
flatpak-devel - update to 1.0.3-7
flatpak-debuginfo - update to 1.0.3-7
flatpak - update to 1.0.3-7
flatpak (Ubuntu package) - addressed in versions 1.0.9-0ubuntu0.4, 1.6.5-0ubuntu0.4, 1.10.2-1ubuntu1.1, 1.10.2-3ubuntu0.1
libflatpak0 (Ubuntu package) - addressed in versions 1.0.9-0ubuntu0.4, 1.6.5-0ubuntu0.4, 1.10.2-1ubuntu1.1, 1.10.2-3ubuntu0.1
flatpak-zsh-completion - addressed in versions 1.2.3-150100.4.8.1, 1.10.5-4.9.1
flatpak - addressed in versions 1.6.2-6, 1.8.5-4
flatpak-libs - addressed in versions 1.6.2-6, 1.8.5-4
flatpak-session-helper - addressed in versions 1.6.2-6, 1.8.5-4
flatpak-selinux - addressed in versions 1.6.2-6, 1.8.5-4
flatpak - addressed in versions 1.10.5-1.fc33, 1.10.5-1.fc34, 1.12.0-1.fc35
system-user-flatpak - update to 1.10.5-4.9.1
sys-apps/flatpak - update to 1.14.4
webkit2gtk - update to 2.34.1-1
wpewebkit - update to 2.34.1-1

External References

Related Security Bulletins