255 lines
13 KiB
JSON
255 lines
13 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-2026-31433",
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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": "2026-03-09T15:48:24.089Z",
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"datePublished": "2026-04-22T08:15:11.719Z",
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"dateUpdated": "2026-08-05T12:22:27.773Z"
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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": "2026-08-05T12:22:27.773Z"
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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: fix potencial OOB in get_file_all_info() for compound requests\n\nWhen a compound request consists of QUERY_DIRECTORY + QUERY_INFO\n(FILE_ALL_INFORMATION) and the first command consumes nearly the entire\nmax_trans_size, get_file_all_info() would blindly call smbConvertToUTF16()\nwith PATH_MAX, causing out-of-bounds write beyond the response buffer.\nIn get_file_all_info(), there was a missing validation check for\nthe client-provided OutputBufferLength before copying the filename into\nFileName field of the smb2_file_all_info structure.\nIf the filename length exceeds the available buffer space, it could lead to\npotential buffer overflows or memory corruption during smbConvertToUTF16\nconversion. This calculating the actual free buffer size using\nsmb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is\ninsufficient and updating smbConvertToUTF16 to use the actual filename\nlength (clamped by PATH_MAX) to ensure a safe copy operation."
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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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 - ksmbd is the in-kernel SMB server listening on TCP port 445, directly reachable over the network by any SMB client.\nAC:L - The attacker can reliably construct a compound request (QUERY_DIRECTORY + QUERY_INFO) where the first command consumes most of the buffer, then trigger the OOB write in the second command with no race conditions or special prerequisites.\nPR:L - The vulnerability requires an authenticated SMB session and tree connection; smb2_check_user_session() and smb2_get_ksmbd_tcon() are enforced before QUERY_INFO is processed, so the attacker needs valid SMB credentials.\nUI:N - No user interaction is required; the attacker sends the malicious compound SMB request directly over the network.\nS:U - The vulnerability stays within the kernel security scope; there is no crossing of a security boundary like VM escape or sandbox escape.\nC:H - The out-of-bounds heap write of up to ~8KB of attacker-influenced data into kernel heap can be leveraged to corrupt adjacent objects and create read primitives for arbitrary kernel memory disclosure.\nI:H - The OOB heap write corrupts adjacent kernel heap objects with partially attacker-controlled data (UTF-16 filename), which can be exploited via heap shaping for arbitrary write primitives and code execution.\nA:H - The out-of-bounds write corrupts kernel heap memory, which will reliably cause kernel crashes or panics."
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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": "f2283680a80571ca82d710bc6ecd8f8beac67d63",
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"lessThan": "3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7",
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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": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77",
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"lessThan": "4cca3eff2099b18672934a39cee70aed835d652c",
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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": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe",
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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": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "7aec5a769d2356cbf344d85bcfd36de592ac96a5",
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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": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "b0cd9725fe2bcc9f37d096b132318a9060373f5d",
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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": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "9d7032851d6f5adbe2739601ca456c0ad3b422f0",
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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": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "beef2634f81f1c086208191f7228bce1d366493d",
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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": "5.15.145",
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"lessThan": "5.15.203",
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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": "6.1.71",
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"lessThan": "6.1.168",
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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": "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": "6.6",
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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": "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": "5.15.203",
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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": "6.1.168",
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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": "6.6.131",
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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": "6.12.80",
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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": "6.18.21",
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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": "6.19.11",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "5.15.145",
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"versionEndExcluding": "5.15.203"
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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": "6.1.71",
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"versionEndExcluding": "6.1.168"
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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": "6.6",
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"versionEndExcluding": "6.6.131"
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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": "6.6",
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"versionEndExcluding": "6.12.80"
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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": "6.6",
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"versionEndExcluding": "6.18.21"
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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": "6.6",
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"versionEndExcluding": "6.19.11"
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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": "6.6",
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"versionEndExcluding": "7.0"
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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/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c"
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},
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{
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"url": "https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d"
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},
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{
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"url": "https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0"
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},
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{
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"url": "https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d"
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}
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],
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"title": "ksmbd: fix potencial OOB in get_file_all_info() for compound requests",
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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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} |