# CVE-2026-97029: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-97029
- Priority: Routine
- CVSS: 5.7 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 29, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | flatpak Debian 13.5 (trixie) | 1.16.6-1~deb13u3 | [DEBIAN-CVE-2026-97029](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97029.md) | Sep 29, 2026 |
| Linux | flatpak Debian 14 | 1.18.4-1 | [DEBIAN-CVE-2026-97029](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97029.md) | Sep 29, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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