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.
Published: 2026-09-29
Score: 5.7 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

Vendor Workaround

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.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6524-1 flatpak security update
History

Tue, 29 Sep 2026 04:00:00 +0000

Type Values Removed Values Added
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.
Title Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-653
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H'}


Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-29T03:43:16.941Z

Reserved: 2026-09-23T21:15:11.736Z

Link: CVE-2026-97029

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-29T04:18:02.573

Modified: 2026-09-29T04:18:02.573

Link: CVE-2026-97029

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-29T06:00:13Z

Weaknesses
  • CWE-653

    Improper Isolation or Compartmentalization