248 lines
12 KiB
JSON
248 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-63892",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.019Z",
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"datePublished": "2026-07-19T14:55:03.568Z",
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"dateUpdated": "2026-07-19T14:55:03.568Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-07-19T14:55:03.568Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: property: Reject dir_len < 4 to prevent size_t underflow\n\nOn the non-root path, __tb_property_parse_dir() takes dir_len from\nentry->length (u16 widened to size_t). Two distinct OOB conditions\nfollow when entry->length < 4:\n\n1. The non-root path begins with kmemdup(&block[dir_offset],\n sizeof(*dir->uuid), ...) which always reads 4 dwords from\n dir_offset. tb_property_entry_valid() only enforces\n dir_offset + entry->length <= block_len, so a crafted entry\n with dir_offset close to the end of the property block and\n entry->length in 0..3 passes that gate but lets the UUID copy\n run off the block (e.g. dir_offset = 497, dir_len = 3 in a\n 500-dword block reads block[497..501]).\n\n2. After the kmemdup, content_len = dir_len - 4 underflows size_t\n to ~SIZE_MAX, nentries becomes SIZE_MAX / 4, and the entry\n walk runs OOB on each iteration until an entry fails\n validation or the kernel oopses on an unmapped page.\n\nReject dir_len < 4 on the non-root path *before* the UUID kmemdup,\nwhich closes both holes.\n\nAlso move INIT_LIST_HEAD(&dir->properties) up to immediately after\nthe dir allocation so the new error-return path (and the existing\nuuid-alloc failure path) calling tb_property_free_dir() sees a\nwalkable list rather than the zero-initialized NULL next/prev that\nlist_for_each_entry_safe() would oops on."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/thunderbolt/property.c"
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],
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"versions": [
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "37abc4504fa19d8f9f1e87792e8a2b8fdb308e40",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "e2d4d51cf5785815fa4e91e0c019e3eb2506a84c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "de618299190b418291609e6921557253bd417e25",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "5506c825f14d810f0690b1f4367cb7249ebb387a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "542a13890b742099c461d70920e97b14e568f6ec",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "d548179adcc87e1bc66b17e00352a1f536e76065",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "3bec49ca55e08fb085cc4318f24b1b37eaab28cb",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
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"lessThan": "de21b59c29e31c5108ddc04210631bbfab81b997",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/thunderbolt/property.c"
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],
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"versions": [
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{
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"version": "4.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.93",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.35",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.12",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "5.10.259"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "5.15.210"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.1.176"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.6.143"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.12.93"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.18.35"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "7.0.12"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/37abc4504fa19d8f9f1e87792e8a2b8fdb308e40"
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},
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{
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"url": "https://git.kernel.org/stable/c/e2d4d51cf5785815fa4e91e0c019e3eb2506a84c"
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},
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{
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"url": "https://git.kernel.org/stable/c/de618299190b418291609e6921557253bd417e25"
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},
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{
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"url": "https://git.kernel.org/stable/c/5506c825f14d810f0690b1f4367cb7249ebb387a"
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},
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{
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"url": "https://git.kernel.org/stable/c/542a13890b742099c461d70920e97b14e568f6ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/d548179adcc87e1bc66b17e00352a1f536e76065"
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},
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{
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"url": "https://git.kernel.org/stable/c/3bec49ca55e08fb085cc4318f24b1b37eaab28cb"
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},
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{
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"url": "https://git.kernel.org/stable/c/de21b59c29e31c5108ddc04210631bbfab81b997"
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}
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],
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"title": "thunderbolt: property: Reject dir_len < 4 to prevent size_t underflow",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |