RHSA-2026:98112 - Security Advisory

Topic

An update for flatpak is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

Security Fix(es):

• flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)
• flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)
• flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)
• flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2532613 - CVE-2026-90616 flatpak: Flatpak: Arbitrary code execution via missing symlink protection
• BZ - 2539416 - CVE-2026-96275 flatpak: flatpak: Arbitrary write access as root via extra-data extraction
• BZ - 2539419 - CVE-2026-96280 flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems
• BZ - 2539569 - CVE-2026-96808 flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer

CVEs

• CVE-2026-90616
• CVE-2026-96275
• CVE-2026-96280
• CVE-2026-96808

References

• https://access.redhat.com/security/updates/classification/#important