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{"acknowledgement": "Red Hat would like to thank Guthrie Armstrong (Coalition Inc.) for reporting this issue.", "bugzilla": {"description": "flatpak: flatpak: Sandboxed app can signal unsandboxed processes in the same process group", "id": "2542698", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2542698"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-653", "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-97029", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-28T13:30:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97029\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97029\nhttps://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2"], "statement": "Red Hat estimates the CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H from the upstream CVSSv4.0 vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N (score 5.1).\nExploitation requires a victim to install and run a malicious or compromised Flatpak app (UI:R), after which the process-group signal leak is triggered automatically with no additional attacker privileges or access complexity beyond that of a normal sandboxed app (AV:N, AC:L, PR:L). No subsequent system beyond the local host is affected, so scope is unchanged (S:U). There is no confidentiality or integrity impact (C:N, I:N). The availability impact is scored for the reasonable worst case described in the upstream advisory: under common desktop configurations (e.g. GNOME Shell), a malicious app can terminate the desktop shell itself, ending the user's entire session (A:H).", "threat_severity": "Moderate"}