CVE-2026-44362

{"id": "CVE-2026-44362", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44362", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-06T20:51:43.694755Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "OP-TEE", "product": "optee_os", "versions": [{"status": "affected", "version": ">= 3.20.0, < 4.11.0"}]}]}], "published": "2026-07-06T20:16:33.950", "references": [{"url": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-fhcg-pp56-8v75", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-285"}]}], "descriptions": [{"lang": "en", "value": "OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.20.0 and prior to version 4.11.0, a vulnerability in OP-TEE\u2019s subkey rollback protection allows the use of revoked or older subkey versions because the system fails to propagate versioning data during the Trusted Application (TA) loading process. In `core/crypto/signed_hdr.c`, the function `shdr_load_pub_key()` parses subkey headers but does not assign the `subkey_version` to the runtime `shdr_pub_key` structure. As a result, the `key->version` field remains at zero regardless of the version specified in the header. When `ree_fs_ta_open()` in `core/kernel/ree_fs_ta.c` calls `check_update_version()`, it passes this zeroed version to the rollback database. Because the database never receives a non-zero version to record, it never advances, effectively bypassing the rollback check and allowing TAs signed with downgraded subkey chains to load successfully. This impacts OP-TEE mainline configurations that utilize subkey-based signing chains for Trusted Application (TA) authentication. Version 4.11.0 contains a patch. No known workarounds are available."}, {"lang": "es", "value": "OP-TEE es un Entorno de Ejecuci\u00f3n Confiable (TEE) dise\u00f1ado como compa\u00f1ero de un kernel de Linux no seguro ejecut\u00e1ndose en n\u00facleos Arm Cortex-A utilizando la tecnolog\u00eda TrustZone. A partir de la versi\u00f3n 3.20.0 y anterior a la versi\u00f3n 4.11.0, una vulnerabilidad en la protecci\u00f3n de reversi\u00f3n de subclave de OP-TEE permite el uso de versiones de subclave revocadas o m\u00e1s antiguas porque el sistema no propaga los datos de versionado durante el proceso de carga de la Aplicaci\u00f3n Confiable (TA). En \u2019core/crypto/signed_hdr.c\u2019, la funci\u00f3n \u2019shdr_load_pub_key()\u2019 analiza los encabezados de subclave pero no asigna la \u2019subkey_version\u2019 a la estructura \u2019shdr_pub_key\u2019 en tiempo de ejecuci\u00f3n. Como resultado, el campo \u2019key -> version\u2019 permanece en cero independientemente de la versi\u00f3n especificada en el encabezado. Cuando \u2019ree_fs_ta_open()\u2019 en \u2019core/kernel/ree_fs_ta.c\u2019 llama a \u2019check_update_version()\u2019, pasa esta versi\u00f3n puesta a cero a la base de datos de reversi\u00f3n. Debido a que la base de datos nunca recibe una versi\u00f3n no nula para registrar, nunca avanza, eludiendo efectivamente la verificaci\u00f3n de reversi\u00f3n y permitiendo que las TA firmadas con cadenas de subclaves degradadas se carguen correctamente. Esto afecta a las configuraciones principales de OP-TEE que utilizan cadenas de firma basadas en subclaves para la autenticaci\u00f3n de Aplicaciones Confiables (TA). La versi\u00f3n 4.11.0 contiene un parche. No se conocen soluciones alternativas disponibles."}], "lastModified": "2026-10-25T20:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D8F56A2E-B76A-4B45-AF68-2036283D85D6", "versionEndIncluding": "4.10.0", "versionStartIncluding": "3.20.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}