---
id: CVE-2026-97029
title: >-
  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
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…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-653
vendor: Red Hat
product: flatpak
affected:
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T04:18:02.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97029'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97029'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542698'
    label: secalert@redhat.com
  - url: 'https://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T04:27:15.488Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.