Vulnerability · Published Sep 29, 2026 · Assigned by redhat
CVE-2026-97029Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
Medium 5.7
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | flatpak | no fix listed | DEBIAN-CVE-2026-97029 |
| Debian:13 | flatpak | 1.16.6-1~deb13u3 | DEBIAN-CVE-2026-97029 |
| Debian:14 | flatpak | 1.18.4-1 | DEBIAN-CVE-2026-97029 |
| Ubuntu:26.04:LTS | flatpak | no fix listed | UBUNTU-CVE-2026-97029 |
| Ubuntu:26.10 | flatpak | no fix listed | UBUNTU-CVE-2026-97029 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-653 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-97029 vdb-entry, x_refsource_REDHAT
- RHBZ#2542698 issue-tracking, x_refsource_REDHAT
- https://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2