# CVE-2021-41133: flatpak: Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Security Fix(es... CVE-2021-41133 is fixed in 8 products on 1 platform, first by flatpak 1.0.9-0ubuntu0.4, released October 8, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-41133 - Priority: High - CVSS: 8.8 (Important) - EPSS: 0.0044 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 8, 2021 ## Description Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Security Fix(es): * flatpak: Sandbox bypass via recent VFS-manipulating syscalls (CVE-2021-41133) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | flatpak RHEL 8 | 0:1.8.5-4.el8_4 | [RHSA-2021:4042](https://patchblox.com/security/data/fix/linux/rhsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.4 | [flatpak 1.0.9-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-1.0.9-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | flatpak Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.4 | [flatpak 1.6.5-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-flatpak-1.6.5-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | flatpak almalinux 8 | 1.8.5-5.el8_5 | [ALEA-2021:4539](https://patchblox.com/security/data/fix/linux/alea-2021-4539.md) | Nov 9, 2021 | | Linux | flatpak ol 8 | 0:1.8.5-4.el8_4 | [ELSA-2021-4042](https://patchblox.com/security/data/fix/linux/elsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-devel almalinux 8 | 1.8.5-5.el8_5 | [ALEA-2021:4539](https://patchblox.com/security/data/fix/linux/alea-2021-4539.md) | Nov 9, 2021 | | Linux | flatpak-libs RHEL 8 | 0:1.8.5-4.el8_4 | [RHSA-2021:4042](https://patchblox.com/security/data/fix/linux/rhsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-libs almalinux 8 | 1.8.5-5.el8_5 | [ALEA-2021:4539](https://patchblox.com/security/data/fix/linux/alea-2021-4539.md) | Nov 9, 2021 | | Linux | flatpak-libs ol 8 | 0:1.8.5-4.el8_4 | [ELSA-2021-4042](https://patchblox.com/security/data/fix/linux/elsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-selinux RHEL 8 | 0:1.8.5-4.el8_4 | [RHSA-2021:4042](https://patchblox.com/security/data/fix/linux/rhsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-selinux almalinux 8 | 1.8.5-5.el8_5 | [ALEA-2021:4539](https://patchblox.com/security/data/fix/linux/alea-2021-4539.md) | Nov 9, 2021 | | Linux | flatpak-selinux ol 8 | 0:1.8.5-4.el8_4 | [ELSA-2021-4042](https://patchblox.com/security/data/fix/linux/elsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-session-helper RHEL 8 | 0:1.8.5-4.el8_4 | [RHSA-2021:4042](https://patchblox.com/security/data/fix/linux/rhsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-session-helper almalinux 8 | 1.8.5-5.el8_5 | [ALEA-2021:4539](https://patchblox.com/security/data/fix/linux/alea-2021-4539.md) | Nov 9, 2021 | | Linux | flatpak-session-helper ol 8 | 0:1.8.5-4.el8_4 | [ELSA-2021-4042](https://patchblox.com/security/data/fix/linux/elsa-2021-4042.md) | Nov 1, 2021 | | Linux | flatpak-tests Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.4 | [flatpak-tests 1.0.9-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-tests-1.0.9-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | flatpak-tests Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.4 | [flatpak-tests 1.6.5-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-flatpak-tests-1.6.5-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | gir1.2-flatpak-1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.4 | [gir1.2-flatpak-1.0 1.0.9-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gir1.2-flatpak-1.0-1.0.9-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | gir1.2-flatpak-1.0 Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.4 | [gir1.2-flatpak-1.0 1.6.5-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gir1.2-flatpak-1.0-1.6.5-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | libflatpak0 Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.4 | [libflatpak0 1.0.9-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libflatpak0-1.0.9-0ubuntu0.4.md) | Oct 8, 2021 | | Linux | libflatpak0 Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.4 | [libflatpak0 1.6.5-0ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libflatpak0-1.6.5-0ubuntu0.4.md) | Oct 8, 2021 | --- Data as of 2026-11-08T19:12:23Z UTC. 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