Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-96275: A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal. CVE-2026-90616: In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | flatpak | 0:1.0.9-10.amzn2.0.8 |
| Amazon Linux · 2 | flatpak-builder | 0:1.0.0-10.amzn2.0.8 |
| Amazon Linux · 2 | flatpak-debuginfo | 0:1.0.9-10.amzn2.0.8 |
| Amazon Linux · 2 | flatpak-devel | 0:1.0.9-10.amzn2.0.8 |
| Amazon Linux · 2 | flatpak-libs | 0:1.0.9-10.amzn2.0.8 |
Vulnerabilities 2
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High 8.8
Flatpak: flatpak: arbitrary write access as root via extra-data extraction
A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path o…
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High 7.4
In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, wh…