222 lines
11 KiB
JSON
222 lines
11 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-2026-64393",
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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": "2026-07-19T15:36:31.785Z",
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"datePublished": "2026-07-25T08:50:39.239Z",
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"dateUpdated": "2026-08-17T04:54:46.744Z"
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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": "2026-08-17T04:54:46.744Z"
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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\nksmbd: run set info with opener credentials\n\nSMB2 SET_INFO handlers call path-based VFS helpers after checking the\naccess mask granted to the SMB handle. Those helpers perform their owner,\ninode permission and LSM checks using the current ksmbd worker credentials.\n\nRun the complete SET_INFO dispatch with the credentials captured when the\nhandle was opened. This also removes the separate security information\ncredential setup and keeps all SET_INFO classes under one credential scope.\n\nDirect override_creds() is used because it can nest with the request\ncredential overrides already used by rename and link helpers."
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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:N/I:H/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 - The vulnerable SMB2 SET_INFO handler is remotely reachable through ksmbd over TCP/445 or SMB Direct.\nAC:L - An attacker can deterministically open a handle and send a crafted SET_INFO request; no race or condition outside the attacker’s control is required.\nPR:N - Although a valid SMB session, writable tree, and suitable handle are required, ksmbd supports passwordless guest sessions on writable shares, making exploitation possible without attacker privileges in a reasonable deployment.\nUI:N - The attacker directly opens the handle and submits the SET_INFO request without any victim action.\nS:U - The bypass affects files and services governed by the same host kernel and filesystem security authority, without crossing a virtualization or sandbox boundary.\nC:N - The flaw provides unauthorized mutation through metadata, xattr, and truncation operations but does not itself disclose file contents or kernel memory.\nI:H - Privileged worker credentials can bypass opener UID, group, capability, inode, and LSM checks, permitting protected metadata changes and destructive truncation of an affected file.\nA:H - Repeated SET_INFO requests can truncate critical files or corrupt security-relevant metadata and xattrs, potentially disabling dependent services or exhausting filesystem resources."
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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/server/smb2pdu.c"
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],
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"versions": [
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{
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"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "5cbabf3a71575cd31bc7785d92d4ab42338a654b",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "b35afd5cf8fab236ef21117e42ee45691d4ffa7b",
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"status": "affected",
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"lessThan": "0ce682867fd506f61f40c76bde7e4205bde34e87",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "20ee516a62989a8d505ee432f9e59525ea23984e",
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "8cc9ec711f5255167247a9ab6a7179b787426ed7",
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"status": "affected",
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{
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"lessThan": "b383bcad3d2fe634b26efbce53e22bbb5753a520",
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"status": "affected",
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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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"fs/smb/server/smb2pdu.c"
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],
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"versions": [
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{
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"version": "5.15",
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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": "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": "6.1.178",
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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": "6.6.145",
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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": "6.12.96",
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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": "6.18.39",
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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": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "6.1.178"
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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/5cbabf3a71575cd31bc7785d92d4ab42338a654b"
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},
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{
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"url": "https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b"
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},
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{
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"url": "https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87"
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},
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{
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"url": "https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e"
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},
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{
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"url": "https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7"
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},
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{
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"url": "https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520"
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}
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],
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"title": "ksmbd: run set info with opener credentials",
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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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} |