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-2025-68806",
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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": "2025-12-24T10:30:51.045Z",
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"datePublished": "2026-01-13T15:29:13.797Z",
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"dateUpdated": "2026-08-05T12:11:38.392Z"
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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": "2026-08-05T12:11:38.392Z"
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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 buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding '+ 1' to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size."
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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:N",
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"baseScore": 7.5,
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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 - The flaw is reachable by a remote SMB2/3 client through ksmbd's SMB2 SET_INFO handler over TCP, normally port 445.\nAC:L - The client directly controls the EA lengths and contents, so one deterministic malformed request triggers the over-read without a race or an external condition.\nPR:N - Ksmbd supports passwordless guest sessions on guest-writable shares, where a remote client can obtain FILE_WRITE_EA access. Under the required highest-severity reasonable deployment, no prior privileges are needed.\nUI:N - The attacker can send the necessary SET_INFO and QUERY_INFO requests without any victim action.\nS:U - The disclosure affects the ksmbd host kernel and does not cross a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The malformed EA stores an uninitialized receive-buffer byte in a user xattr that the client can query. Repeated requests with heap grooming can slowly disclose kernel heap contents, warranting high confidentiality impact under conservative scoring.\nI:N - The flaw does not corrupt kernel memory or provide a kernel write primitive; it only changes a user xattr that the client is already authorized to set.\nA:N - The receive allocation includes an extra tail byte, so the faulty copy reads uninitialized in-allocation data rather than faulting; no crash, hang, or resource exhaustion results."
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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": "d070c4dd2a5bed4e9832eec5b6c029c7d14892ea",
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"lessThan": "cae52c592a07e1d3fa3338a5f064a374a5f26750",
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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": "0ba5439d9afa2722e7728df56f272c89987540a4",
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"lessThan": "a28a375a5439eb474e9f284509a407efb479c925",
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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": "0ba5439d9afa2722e7728df56f272c89987540a4",
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"lessThan": "d26af6d14da43ab92d07bc60437c62901dc522e6",
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"status": "affected",
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},
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{
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"version": "0ba5439d9afa2722e7728df56f272c89987540a4",
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"lessThan": "6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4",
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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": "0ba5439d9afa2722e7728df56f272c89987540a4",
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"status": "affected",
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"versionType": "git"
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{
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"version": "bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c",
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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": "1a13ecb96230e8b7b91967e292836f7b01ec8111",
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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": "404e7c01e16288b5e0171d1d8fd3328e806d0794",
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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": "6.1.52",
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"lessThan": "6.1.160",
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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": "5.15.131",
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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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"version": "6.4.15",
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"lessThan": "6.5",
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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": "6.5.2",
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"lessThan": "6.6",
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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": "6.1.160",
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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": "6.6.120",
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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": "6.12.64",
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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": "6.18.3",
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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",
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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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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.52",
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"versionEndExcluding": "6.1.160"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"
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},
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{
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"url": "https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925"
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},
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{
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"url": "https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6"
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},
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{
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"url": "https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"
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}
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],
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"title": "ksmbd: fix buffer validation by including null terminator size in EA length",
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