CVE-2026-74585

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A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw->ports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/thunderbolt/eeprom.c"], "versions": [{"version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6", "lessThan": "6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c", "status": "affected", "versionType": "git"}, {"version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6", "lessThan": "3d3c212b70633332ab71672aa2bc6af257d2ec83", "status": "affected", "versionType": "git"}, {"version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6", "lessThan": "b98e1e28bd95b0fa33164eec1e763d26c7058b39", 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"https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"}], "title": "thunderbolt: Bound the DROM dual link port number before indexing sw->ports", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74585", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:59:46.799768Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T17:05:48.673Z"}}]}}

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A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw->ports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:31:38.339Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74585", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:48.673Z", "dateReserved": "2026-08-15T05:44:03.918Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:31:38.339Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw->ports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nthunderbolt: Limitar el n\u00famero de puerto de enlace dual DROM antes de indexar sw -> ports\n\ntb_drom_parse_entry_port() valida el header -> index proporcionado por el dispositivo contra sw -> config.max_port_number antes de indexar sw -> ports[], pero el campo hermano entry -> dual_link_port_nr -- un valor de 6 bits tambi\u00e9n le\u00eddo del DROM -- indexa el mismo array sin dicha comprobaci\u00f3n. Un dispositivo Thunderbolt malicioso o malformado puede establecer dual_link_port_nr m\u00e1s all\u00e1 del sw -> ports[] asignado (max_port_number + 1 entradas), produciendo un puntero tb_port fuera de l\u00edmites que se almacena y luego se desreferencia.\n\nRechazar una entrada de puerto cuyo dual_link_port_nr excede max_port_number, el mismo l\u00edmite ya aplicado a header -> index."}], "id": "CVE-2026-74585", "lastModified": "2026-11-06T17:19:51.310", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74585", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:59:46.799768Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:30.560", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: thunderbolt: Bound the DROM dual link port number before indexing sw->ports", "id": "2521399", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521399"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-823", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nthunderbolt: Bound the DROM dual link port number before indexing sw->ports\ntb_drom_parse_entry_port() validates the device-supplied header->index\nagainst sw->config.max_port_number before indexing sw->ports[], but the\nsibling field entry->dual_link_port_nr -- a 6-bit value also read from\nthe DROM -- indexes the same array with no such check. A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw->ports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index.", "A flaw was found in the Linux kernel's Thunderbolt driver. A malicious or malformed Thunderbolt device can provide an invalid port number, leading to an out-of-bounds memory access. This can result in memory corruption and potentially lead to a denial of service or other unspecified impacts."], "name": "CVE-2026-74585", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74585\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74585\nhttps://lore.kernel.org/linux-cve-announce/2026082209-CVE-2026-74585-8fe6@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,3d3c212b70633332ab71672aa2bc6af257d2ec83)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,b98e1e28bd95b0fa33164eec1e763d26c7058b39)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,50f0c8dd8c3390f851cfb97ca13116f9ee6469d1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,f28066057134aa9294caa597b670daf505ad9dce)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,40d2ffb74094cf36edbe05855566a4c58b6ce808)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,f32c3a9a77cfb50934a60b05d5407649af062535)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6,d6764992f17b23d91ff93ce905ab53c2aa7191f0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T16:30:05.475894+00:00", "updated": "2026-08-25T16:30:06.101085+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}