CVE-2026-97029 Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
A malicious Flatpak app can terminate unsandboxed processes sharing its process group, causing denial of service on the host system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-97029?
CVE-2026-97029 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 29 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-653
Which versions are affected by CVE-2026-97029?
How do I fix CVE-2026-97029?
Apply the vendor's patch.
Is CVE-2026-97029 being exploited?
There is no known exploitation of CVE-2026-97029 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-97029, UBUNTU-CVE-2026-97029.