CVE-2026-29009

{"id": "CVE-2026-29009", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-29009", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-08T16:36:54.591359Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.2, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.8, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/u-boot/u-boot", "vendor": "u-boot", "product": "u-boot", "versions": [{"status": "affected", "version": "0", "lessThan": "2026.07-rc2", "versionType": "custom"}], "packageURL": "pkg:github/u-boot/u-boot", "defaultStatus": "affected"}]}], "published": "2026-07-08T17:17:21.173", "references": [{"url": "https://git.u-boot-project.org/u-boot/u-boot/-/commit/d6694018eaddefac6aae974f9cec72fd6e58f1bc", "source": "disclosure@vulncheck.com"}, {"url": "https://git.u-boot-project.org/u-boot/u-boot/-/releases/v2026.07-rc2", "source": "disclosure@vulncheck.com"}, {"url": "https://lists.denx.de/pipermail/u-boot/2026-May/617853.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://u-boot.org/", "tags": ["Product"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/u-boot-rc3-buffer-overflow-in-nfs-readlink-reply-via-nfs-readlink", "tags": ["Exploit", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/", "tags": ["Exploit", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-120"}]}], "descriptions": [{"lang": "en", "value": "U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine."}, {"lang": "es", "value": "U-Boot hasta 2026.04-rc3 contiene una vulnerabilidad de desbordamiento de b\u00fafer en nfs_readlink_reply() (net/nfs-common.c) cuando CONFIG_CMD_NFS est\u00e1 habilitado, permitiendo a un servidor NFS malicioso o comprometido desbordar el b\u00fafer nfs_path_buff de 2048 bytes al devolver m\u00faltiples destinos de enlace simb\u00f3lico relativos que se a\u00f1aden sin validaci\u00f3n de longitud acumulativa. Los atacantes pueden enviar dos o m\u00e1s respuestas READLINK que contienen destinos de enlace simb\u00f3lico relativos de aproximadamente 1100 bytes cada uno para corromper variables BSS adyacentes incluyendo nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state y rpc_id, logrando potencialmente corrupci\u00f3n de memoria y control sobre la m\u00e1quina de estados del cliente NFS."}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "097D2949-BA7E-411B-81C1-7AADF57C4849", "versionEndExcluding": "2026.04"}, {"criteria": "cpe:2.3:a:denx:u-boot:2026.04:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "39D97BA6-0B7B-4633-971E-3C79C58A57A5"}, {"criteria": "cpe:2.3:a:denx:u-boot:2026.04:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "94B93B6C-02D1-42C9-B862-C945511A0297"}, {"criteria": "cpe:2.3:a:denx:u-boot:2026.04:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "86FAEAE1-FCD8-426D-9452-E1885014C9A9"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}