226 lines
12 KiB
JSON
226 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-2026-64397",
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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": "2026-07-25T08:50:41.620Z",
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"dateUpdated": "2026-08-17T04:54:51.854Z"
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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": "2026-08-17T04:54:51.854Z"
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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: serialize QUERY_DIRECTORY requests per file\n\nsmb2_query_dir() stores a pointer to its stack-allocated private data in\nthe ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the\nsame file handle can overwrite this pointer while an iterate_dir() callback\nis still using it, resulting in a stack use-after-free.\n\nAdd a per-file mutex and hold it while accessing the shared directory\nenumeration state. The lock covers scan restart, dot entry state,\nreaddir_data setup and iteration, and response construction. This prevents\nanother request from replacing readdir_data.private before the current\nrequest has finished using it and also serializes the shared file position."
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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:H/A:H",
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"baseScore": 9.8,
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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 - KSMBD processes attacker-supplied SMB2 QUERY_DIRECTORY requests over TCP port 445, so the vulnerable callback is remotely reachable.\nAC:L - The attacker controls both concurrent requests using the same directory handle and can prolong one enumeration while rapidly completing the other, making the race repeatable.\nPR:N - Although a valid session, tree connection, and readable directory handle are required, ksmbd supports passwordless guest sessions; a guest-readable share therefore permits exploitation without pre-existing privileges.\nUI:N - No victim action is required after the SMB server and accessible share are available.\nS:U - Exploitation compromises the kernel hosting the SMB server without crossing a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The stack use-after-free exposes stale stack, work, search-pattern, and response-buffer pointers, providing a defensible path to high-impact kernel memory disclosure.\nI:H - The callback writes attacker-influenced directory-entry data through a stale d_info pointer and modifies reclaimed stack or response-buffer memory, potentially enabling arbitrary corruption and code execution.\nA:H - Dereferencing or writing through the freed stack and associated stale heap pointers can cause a kernel oops or panic, and the attacker can trigger the race repeatedly over the network."
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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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"fs/smb/server/vfs_cache.c",
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"fs/smb/server/vfs_cache.h"
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],
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"versions": [
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{
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"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "1426fd79102539bc0ab5c8fced047ad4313b9908",
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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": "2a64dbf9c739ddf7a25a066507597bf89f8f73d2",
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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": "64dac2d486ec1eb18dc00968b16a230b6b75ec24",
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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": "a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199",
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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": "fd22b039a5a05bc1d6818e9dcd1001fb432a829d",
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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": "be6d26bf27499977c746abc163659915082348d8",
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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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"fs/smb/server/smb2pdu.c",
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"fs/smb/server/vfs_cache.c",
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"fs/smb/server/vfs_cache.h"
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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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"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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"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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]
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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/1426fd79102539bc0ab5c8fced047ad4313b9908"
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},
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{
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"url": "https://git.kernel.org/stable/c/2a64dbf9c739ddf7a25a066507597bf89f8f73d2"
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},
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{
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"url": "https://git.kernel.org/stable/c/64dac2d486ec1eb18dc00968b16a230b6b75ec24"
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},
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{
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"url": "https://git.kernel.org/stable/c/a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199"
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},
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{
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"url": "https://git.kernel.org/stable/c/fd22b039a5a05bc1d6818e9dcd1001fb432a829d"
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},
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{
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"url": "https://git.kernel.org/stable/c/be6d26bf27499977c746abc163659915082348d8"
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}
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],
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"title": "ksmbd: serialize QUERY_DIRECTORY requests per file",
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} |