{"id":"CVE-2026-63893","revision":null,"records":[{"revision":"e3e7f7343d35453ca6ced61ed191a36b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63893","aliases":[],"title":"thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: property: Reject u32 wrap in tb_property_entry_valid()\n\nentry->value is u32 and entry->length is u16; the sum is performed in\nu32 and wraps. A malicious XDomain peer can pick\nvalue = 0xffffff00, length = 0x100 so the sum 0x100000000 wraps to 0\nand passes the > block_len check. tb_property_parse() then passes\nentry->value to parse_dwdata() as a dword offset into the property\nblock, reading attacker-directed memory far past the allocation.\n\nFor TEXT-typed entries with the \"deviceid\" or \"vendorid\" keys this\nlands in xd->device_name / xd->vendor_name and is readable back via\nthe per-XDomain device_name / vendor_name sysfs attributes; the leak\nis NUL-bounded (kstrdup() stops at the first zero byte) and\nuntargeted (the attacker picks a delta, not an absolute address).\nDATA-typed entries are parsed into property->value.data but not\ngenerically surfaced to userspace.\n\nUse check_add_overflow() so a wrapped sum is rejected.","state":0,"publishedAt":"2026-07-19T14:55:04.288+00:00","modifiedAt":"2026-10-19T20:17:55.146+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/thunderbolt/property.c\"\n ],\n \"versions\": [\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"6a63623621639acbb39bc2d9fb09559681716695\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"9fee50c4e1e42f6d3cbe30df584f9f648f626071\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"8d4a758b407ab3de3be86d1ceadfa35d717d30c7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"5c06a3043ad944f087bb2ae0aae28d820bb9f460\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"31b98e503ecca8077e5247253dd5425ab84bc96d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"a47784aee77f33f786dc5d7375db821bdae68792\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdae7c07e3e3509eaabc18c1640a55dc5b99c179\",\n \"lessThan\": \"01deda0152066c6c955f0619114ea6afa070aaec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/thunderbolt/property.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/6a63623621639acbb39bc2d9fb09559681716695","https://git.kernel.org/stable/c/e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36","https://git.kernel.org/stable/c/9fee50c4e1e42f6d3cbe30df584f9f648f626071","https://git.kernel.org/stable/c/8d4a758b407ab3de3be86d1ceadfa35d717d30c7","https://git.kernel.org/stable/c/5c06a3043ad944f087bb2ae0aae28d820bb9f460","https://git.kernel.org/stable/c/31b98e503ecca8077e5247253dd5425ab84bc96d","https://git.kernel.org/stable/c/a47784aee77f33f786dc5d7375db821bdae68792","https://git.kernel.org/stable/c/01deda0152066c6c955f0619114ea6afa070aaec"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63893","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63893","identifiers":["CVE-2026-63893"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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