CVE-2026-97029
5.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Summary
Flatpak's process ID namespace separation does not prevent a sandboxed app's kill(0, signal) or killpg(0, signal) calls from reaching processes outside the sandbox that share the same process group. A malicious or compromised Flatpak app can use this to cause denial of service by terminating processes outside its sandbox, such as the desktop shell.
Affected Software
| Vendor | Product | Version Range | Status |
|---|
Weaknesses
- CWE-653: Improper Isolation or Compartmentalization
Workarounds
Run Flatpak apps in a new session (setsid flatpak run … or setsid() in the parent) or a new process group (setpgid (0, 0) in the parent), or avoid running untrusted Flatpak apps.
References
- https://access.redhat.com/security/cve/CVE-2026-97029
- https://bugzilla.redhat.com/show_bug.cgi?id=2542698
- https://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2
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