CVE-2026-33243

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{"affected": [{"affectedData": [{"product": "barebox", "vendor": "barebox", "versions": [{"status": "affected", "version": ">= 2016.03.0, < 2025.09.3"}, {"status": "affected", "version": ">= 2025.10.0, < 2026.03.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:*", "matchCriteriaId": "F9C10736-4F83-4DFE-B39D-8F93E6C8D55D", "versionEndExcluding": "2025.09.3", "versionStartIncluding": "2016.03.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:*", "matchCriteriaId": "D19A8826-6289-4EEA-8093-8F92E7A66461", "versionEndExcluding": "2026.03.1", "versionStartIncluding": "2025.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "barebox is a bootloader. In barebox from version 2016.03.0 to before version 2026.03.1 (and the corresponding backport to 2025.09.3), an attacker could exploit a FIT signature verification vulnerability to trick the bootloader into booting different images than those that were verified as part of a signed configuration. mkimage(1) sets the hashed-nodes property of the FIT signature node to list which nodes of the FIT were hashed as part of the signing process as these will need to be verified later on by the bootloader. However, hashed-nodes itself is not part of the hash and could therefore be modified to allow booting different images than those that have been verified. This issue has been patched in barebox versions 2026.03.1 and backported to 2025.09.3."}, {"lang": "es", "value": "barebox es un gestor de arranque. En barebox desde la versi\u00f3n 2016.03.0 hasta antes de la versi\u00f3n 2025.09.3 y desde la versi\u00f3n 2025.10.0 hasta antes de la versi\u00f3n 2026.03.1, al crear un FIT, mkimage(1) establece la propiedad hashed-nodes del nodo de firma FIT para listar qu\u00e9 nodos del FIT fueron hasheados como parte del proceso de firma, ya que estos deber\u00e1n ser verificados posteriormente por el gestor de arranque. Sin embargo, hashed-nodes en s\u00ed mismo no forma parte del hash y por lo tanto puede ser modificado por un atacante para enga\u00f1ar al gestor de arranque para que arranque im\u00e1genes diferentes a las que han sido verificadas. Este problema ha sido parcheado en las versiones de barebox 2025.09.3 y 2026.03.1."}], "id": "CVE-2026-33243", "lastModified": "2026-09-11T15:55:06.403", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.5, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33243", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-24T15:31:22.066555Z", "version": "2.0.3"}}]}, "published": "2026-03-20T23:16:47.167", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/barebox/barebox/commit/aca01795056d51060cb096f9a1ea309361743e05"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/barebox/barebox/security/advisories/GHSA-3fvj-q26p-j6h4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2016.03.0,2025.09.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2025.10.0,2026.03.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "barebox", "source": "cna", "vendor": "barebox"}, "product": "barebox", "vendor": "barebox"}], "analysis": {"en": {"generated_at": "2026-03-26T22:12:01.774892+00:00", "value": {"mitigation_remediation": ["Apply the patched barebox version 2026.03.1 or the backported 2025.09.3 release, or update affected U\u2011Boot builds that incorporate the fix.", "Verify that firmware images are signed with the updated bootloader and that the hashed\u2011nodes field is immutable.", "Monitor vendor advisories for future updates and ensure that any firmware flashing process validates authenticity before installation."], "summary": {"action": "Immediate Patch", "impact": "Bootloader integrity bypass allowing execution of unsigned images"}, "threat_synthesis": {"affected_systems": "Products impacted include the barebox bootloader from release 2016.03.0 up through 2026.03.0, as well as the backported 2025.09.3 build. Related U\u2011Boot releases from denx, such as the 2026.04 release candidates, and barebox images supplied by pengutronix are also affected.", "description_and_impact": "The vulnerability permits an attacker to alter the signed image metadata so that the bootloader ignores integrity checks on certain firmware components and loads replacements that were not signed, facilitating the deployment of malicious firmware during system startup.", "risk_and_exploitability": "Severity is high with a score of 8.3, and the likelihood of exploitation is low, noted as less than one percent. The flaw is not recorded in the known exploited vulnerabilities catalog. Exploitation would require the ability to construct or modify FIT images, typically through firmware modification or direct device access; the attack vector is therefore most likely local or physical."}}}}, "created": "2026-03-23T09:52:12.141000+00:00", "updated": "2026-03-27T09:21:28.943206+00:00", "vendors": ["barebox", "barebox$PRODUCT$barebox"]}