{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63893", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.019Z", "datePublished": "2026-07-19T14:55:04.288Z", "dateUpdated": "2026-07-19T14:55:04.288Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T14:55:04.288Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/thunderbolt/property.c"], "versions": [{"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "6a63623621639acbb39bc2d9fb09559681716695", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "9fee50c4e1e42f6d3cbe30df584f9f648f626071", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "8d4a758b407ab3de3be86d1ceadfa35d717d30c7", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "5c06a3043ad944f087bb2ae0aae28d820bb9f460", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "31b98e503ecca8077e5247253dd5425ab84bc96d", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "a47784aee77f33f786dc5d7375db821bdae68792", "status": "affected", "versionType": "git"}, {"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "01deda0152066c6c955f0619114ea6afa070aaec", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/thunderbolt/property.c"], "versions": [{"version": "4.15", "status": "affected"}, {"version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6a63623621639acbb39bc2d9fb09559681716695"}, {"url": "https://git.kernel.org/stable/c/e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36"}, {"url": "https://git.kernel.org/stable/c/9fee50c4e1e42f6d3cbe30df584f9f648f626071"}, {"url": "https://git.kernel.org/stable/c/8d4a758b407ab3de3be86d1ceadfa35d717d30c7"}, {"url": "https://git.kernel.org/stable/c/5c06a3043ad944f087bb2ae0aae28d820bb9f460"}, {"url": "https://git.kernel.org/stable/c/31b98e503ecca8077e5247253dd5425ab84bc96d"}, {"url": "https://git.kernel.org/stable/c/a47784aee77f33f786dc5d7375db821bdae68792"}, {"url": "https://git.kernel.org/stable/c/01deda0152066c6c955f0619114ea6afa070aaec"}], "title": "thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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