{"id":"CVE-2026-74585","state":"PUBLISHED","title":"thunderbolt: Bound the DROM dual link port number before indexing sw->ports","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Bound the DROM dual link port number before indexing sw->ports\n\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.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index.","publishedAt":"2026-08-22T15:31:38.339Z","updatedAt":"2026-08-22T15:31:38.339Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"3d3c212b70633332ab71672aa2bc6af257d2ec83","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"b98e1e28bd95b0fa33164eec1e763d26c7058b39","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"50f0c8dd8c3390f851cfb97ca13116f9ee6469d1","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"f28066057134aa9294caa597b670daf505ad9dce","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"40d2ffb74094cf36edbe05855566a4c58b6ce808","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"f32c3a9a77cfb50934a60b05d5407649af062535","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"d6764992f17b23d91ff93ce905ab53c2aa7191f0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/eeprom.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.152","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/eeprom.c"]}],"references":["https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c","https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83","https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39","https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1","https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce","https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808","https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535","https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74585.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74585","state":"PUBLISHED","datePublished":"2026-08-22T15:31:38.339Z","dateUpdated":"2026-08-22T15:31:38.339Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.918Z"},"containers":{"cna":{"title":"thunderbolt: Bound the DROM dual link port number before indexing sw->ports","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Bound the DROM dual link port number before indexing sw->ports\n\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.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header->index."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"3d3c212b70633332ab71672aa2bc6af257d2ec83","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"b98e1e28bd95b0fa33164eec1e763d26c7058b39","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"50f0c8dd8c3390f851cfb97ca13116f9ee6469d1","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"f28066057134aa9294caa597b670daf505ad9dce","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"40d2ffb74094cf36edbe05855566a4c58b6ce808","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"f32c3a9a77cfb50934a60b05d5407649af062535","versionType":"git"},{"version":"cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6","status":"affected","lessThan":"d6764992f17b23d91ff93ce905ab53c2aa7191f0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/eeprom.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.152","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/eeprom.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c"},{"url":"https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83"},{"url":"https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39"},{"url":"https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"},{"url":"https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce"},{"url":"https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808"},{"url":"https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535"},{"url":"https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-22T15:31:38.339Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}