CVE-2026-43629

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Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite."}, {"lang": "es", "value": "Las compilaciones b4882 a b9058 de llama.cpp contienen una vulnerabilidad de desbordamiento de b\u00fafer de mont\u00f3n en la ruta de restauraci\u00f3n del estado de la cach\u00e9 KV, donde la funci\u00f3n state_read_data() calcula el tama\u00f1o de escritura sin verificaci\u00f3n de desbordamiento, permitiendo a los atacantes con acceso de escritura al directorio slot_save_path corromper la memoria del mont\u00f3n. Los atacantes pueden crear archivos de estado maliciosos donde la multiplicaci\u00f3n de cell_count desborda o excede la asignaci\u00f3n del b\u00fafer del tensor para escribir bytes controlados por el atacante m\u00e1s all\u00e1 de los l\u00edmites del b\u00fafer, lo que podr\u00eda resultar en corrupci\u00f3n de metadatos del mont\u00f3n, corrupci\u00f3n de pesos del modelo o ejecuci\u00f3n de c\u00f3digo arbitrario mediante la sobrescritura de punteros de funci\u00f3n."}], "id": "CVE-2026-43629", "lastModified": "2026-10-29T21:17:23.650", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.2, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43629", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-07T15:39:29.511247Z", "version": "2.0.3"}}]}, "published": "2026-08-06T22:17:05.917", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches"}, {"source": "disclosure@vulncheck.com", "tags": ["Mitigation", "Patch", "Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/llama-cpp-b4882-b9058-buffer-overflow-in-kv-cache-state-restore"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-787"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "llama.cpp: llama.cpp: Arbitrary code execution via crafted KV cache state files", "id": "2512255", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512255"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.", "A flaw was found in llama.cpp. An attacker with local write access to specific directories can exploit a heap buffer overflow vulnerability. By crafting malicious data files, the attacker can cause the system to write beyond intended memory boundaries. This could lead to data corruption or, in severe cases, allow the attacker to execute unauthorized code, potentially compromising the system."], "mitigation": {"lang": "en:us", "value": "Restrict write access to the `slot_save_path` directory used by llama.cpp. Ensure that only trusted processes and users have permissions to write to this location. This prevents an attacker from introducing malicious KV cache state files that could trigger the heap buffer overflow. For deployments, consider running llama.cpp with the least necessary privileges and within a sandboxed environment to further limit the impact of potential file system compromises."}, "name": "CVE-2026-43629", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/bootc-gaudi-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/bootc-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}], "public_date": "2026-08-06T15:48:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43629\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43629\nhttps://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches"], "statement": "Exploitation requires an attacker to possess write access to the slot storage location and plant a maliciously crafted key-value cache state file prior to a restoration operation. If successfully processed, the heap memory corruption can grant complete compromise of Confidentiality, Integrity, and Availability (C:H, I:H, A:H) within the context of the running application process. Environments that restrict file write access to state directories, utilize read-only session paths, or run stateless inference pipelines without state restore operations are completely unaffected.", "threat_severity": "Important"}

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