flatpak: Flatpak's process ID namespace separation does not prevent a sandboxed app's kill(0, signal) or killpg(0, signal) cal...
CVE-2026-97029 is fixed in flatpak on 1 platform, first by DEBIAN-CVE-2026-97029, released September 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| flatpak · Debian 13.5 (trixie) | 1.16.6-1~deb13u3 | DEBIAN-CVE-2026-97029 | Sep 29, 2026 |
| flatpak · Debian 14 | 1.18.4-1 | DEBIAN-CVE-2026-97029 | Sep 29, 2026 |
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