CVE-2026-97029 — Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
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 th…
Published: 2026-09-29 · CVSS: 5.7 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7