170 lines
8.7 KiB
JSON
170 lines
8.7 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-2026-64257",
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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": "2026-07-19T15:36:31.773Z",
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"datePublished": "2026-07-25T08:49:09.345Z",
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"dateUpdated": "2026-08-17T04:52:09.787Z"
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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": "2026-08-17T04:52:09.787Z"
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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\nsmb: client: reject overlapping data areas in SMB2 responses\n\nCommit 53b7c271f06b (\"smb: client: restrict implied bcc[0] exemption to\nresponses without data area\") restricted the implied bcc[0] length\nexception to responses without a data area. However, the overlap\nhandling in __smb2_calc_size() clears data_length, which can make an\ninvalid response appear to have no data area and so qualify for the\nexception.\n\nTrack data area overlap separately and reject such responses before\napplying the length compatibility exceptions."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - A malicious or compromised SMB server can deliver the crafted SMB2 response over TCP during client negotiation.\nAC:L - The overlapping offset and oversized length are attacker-controlled and deterministically bypass validation; no race or uncontrolled memory layout is required to trigger the out-of-bounds read.\nPR:N - The vulnerable NEGOTIATE response is processed before SMB authentication or signature verification, requiring no privileges or credentials on the target.\nUI:N - An already configured SMB mount can negotiate during automatic mounting or reconnection without a human opening crafted content.\nS:U - The vulnerable parser and the affected kernel memory remain within the Linux kernel's security authority.\nC:H - The validation mismatch permits an attacker-controlled ASN.1 length to read far beyond the 448-byte receive object, potentially traversing tens of kilobytes of adjacent kernel memory.\nI:N - The investigated paths provide an out-of-bounds read but no out-of-bounds write, use-after-free, type confusion, or other arbitrary modification primitive.\nA:H - The slab out-of-bounds access is repeatable and can produce a kernel fault or panic, particularly on hardened or memory-safety-instrumented deployments."
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}
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]
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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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"fs/smb/client/smb2misc.c"
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],
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"versions": [
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{
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"version": "31c6312608c60b72a1feb99a5afb680645a3e8a3",
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"lessThan": "445ece263131780dee273d727a4d6f11934feec7",
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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": "573e502d14714d2947e22e7eff40ec20a6a44a42",
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"lessThan": "36bfa52459e45c0d5b668de2f1c91f6dc5c67775",
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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": "419ec1b604d7fb60c10aec2dc062371f9fcd4940",
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"lessThan": "4a9d2657d3e05f6ed09c148cb127b4e58702275f",
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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": "ceb875a375dedbf51c9425c1d13a2d7a8435c08c",
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"lessThan": "fdafa1e68dc75045b7b617e6e7d2854950804d83",
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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": "6e9d10f62773b99bd927940fd9cbdfe7207e23ff",
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"lessThan": "57cba95f0e97c6f6e45e6731da30aff091bd7460",
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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": "53b7c271f06be4dd5cfc8c6ef552a8355c891a7f",
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"lessThan": "8986c932905ea508d66da421eb2eb6e676ace1fe",
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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": "8d0bbc78046d264bbf6a574ea6f9072258a43e35",
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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": "b6a381c01e2ac98a48e32ac0f2a45bbadd9e26b0",
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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": "5.10.261",
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"lessThan": "5.11",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.212",
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"lessThan": "5.16",
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"status": "affected",
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"versionType": "semver"
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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": "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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"fs/smb/client/smb2misc.c"
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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": "5.10.261"
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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": "5.15.212"
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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/445ece263131780dee273d727a4d6f11934feec7"
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},
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{
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"url": "https://git.kernel.org/stable/c/36bfa52459e45c0d5b668de2f1c91f6dc5c67775"
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},
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{
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"url": "https://git.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275f"
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},
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{
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"url": "https://git.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83"
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},
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{
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"url": "https://git.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460"
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},
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{
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"url": "https://git.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1fe"
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}
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],
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"title": "smb: client: reject overlapping data areas in SMB2 responses",
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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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} |