MEDIUM 5.7 NVD
CVE-2026-97029
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 sand
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
$ sudo apt install --only-upgrade flatpakReferences
- https://access.redhat.com/security/cve/CVE-2026-97029
- https://bugzilla.redhat.com/show_bug.cgi?id=2542698
- https://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2
This medium severity vulnerability with a CVSS score of 5.7 was published on 2026-09-29 via NVD. A remediation command is available below.
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