212 lines
11 KiB
JSON
212 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-2026-93801",
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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": "2026-09-18T17:59:28.789Z",
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"datePublished": "2026-09-24T16:02:35.496Z",
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"dateUpdated": "2026-10-21T12:52:38.635Z"
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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": "2026-10-21T12:52:38.635Z"
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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: zero-initialize stack-allocated cifs_open_info_data\n\nStack-allocated cifs_open_info_data may contain random data.\nThis can make some fields have wrong value if they are not set later."
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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:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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:L - smb_set_file_info, cifs_query_mf_symlink, and __cifs_sfu_make_node allocate cifs_open_info_data on the stack and pass it to open/query_path_info. Those run only from local VFS setattr (cifs_setattr_nounix), O_TMPFILE (set_tmpfile_attr), sfu mknod/symlink, and MF-symlink lookup (check_mf_symlink), not from ksmbd or demux-thread PDU parsing.\nAC:H - smb_set_file_info calls cifs_query_path_info, which walks uninitialized wsl.eas, only when the SMB1 session lacks CAP_NT_SMBS, and that walk runs only after the query sets reparse_point from ATTR_REPARSE_POINT. A local attacker cannot strip CAP_NT_SMBS or force that DOS attribute on a typical NT/SMB2/SMB3 server.\nPR:L - cifs_setattr_nounix → cifs_set_file_info needs only inode ownership or directory write (utimensat, chmod clearing ATTR_READONLY, O_TMPFILE via set_tmpfile_attr). CIFS is not FS_USERNS_MOUNT, but using an already-mounted share does not require init-namespace CAP_SYS_ADMIN.\nUI:N - The attacker issues setattr, mknod/symlink, or lookup themselves on a share that is already mounted (fstab/autofs/CIFS home). No separate victim mount or open is required at exploit time.\nS:U - The stack out-of-bounds walk/write in cifs_query_path_info stays inside the client kernel CIFS code and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - With ATTR_REPARSE_POINT set, cifs_query_path_info walks data->wsl.eas using leftover next_entry_offset with no bound against SMB2_WSL_MAX_QUERY_EA_RESP_SIZE, an unbounded out-of-bounds read of kernel stack and adjacent memory.\nI:H - After that walk, CIFSSMBQAllEAs writes $LXMOD/$LXDEV through the wild ea pointer and the code stores next_entry_offset/ea_name_length/ea_value_length at that location, a stack out-of-bounds write.\nA:H - The while (next) loop over uninitialized next_entry_offset can spin without bound or dereference unmapped memory and oops, hanging or crashing the setattr path."
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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/link.c",
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"fs/smb/client/smb1ops.c",
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"fs/smb/client/smb2ops.c"
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],
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"versions": [
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{
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"version": "436cfdbc57d98808fce427d9a8d97691374989b3",
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"lessThan": "2c5db82778f560121efda9e052e2f19c2d807c1b",
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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": "fc2f2011d3d84b56f536b4a25a4bb2fa1b13d520",
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"lessThan": "74ff47e6c4213fcfeba2de448d9cbda200507d22",
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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": "057ac50638bcece64b3b436d3a61b70ed6c01a34",
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"lessThan": "22532dd88694ed20bdd47523ffa709f166ce776b",
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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": "057ac50638bcece64b3b436d3a61b70ed6c01a34",
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"lessThan": "8fce4cf4369c766a3293a05419500cbfde72e60d",
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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": "83d3bc866530a36a465b47cce4d2a9def2411960",
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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": "6.6.113",
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"lessThan": "6.6.160",
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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": "6.12.54",
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"lessThan": "6.12.111",
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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": "6.17.4",
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"lessThan": "6.18",
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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/client/link.c",
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"fs/smb/client/smb1ops.c",
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"fs/smb/client/smb2ops.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "6.18",
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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": "6.6.160",
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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": "6.12.111",
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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": "6.18.53",
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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": "7.2",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.113",
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"versionEndExcluding": "6.6.160"
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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": "6.12.54",
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"versionEndExcluding": "6.12.111"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.18.53"
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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": "6.18",
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"versionEndExcluding": "7.2"
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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": "6.17.4"
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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/2c5db82778f560121efda9e052e2f19c2d807c1b"
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},
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{
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"url": "https://git.kernel.org/stable/c/74ff47e6c4213fcfeba2de448d9cbda200507d22"
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},
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{
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"url": "https://git.kernel.org/stable/c/22532dd88694ed20bdd47523ffa709f166ce776b"
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},
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{
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"url": "https://git.kernel.org/stable/c/8fce4cf4369c766a3293a05419500cbfde72e60d"
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}
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],
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"title": "smb/client: zero-initialize stack-allocated cifs_open_info_data",
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} |