264 lines
14 KiB
JSON
264 lines
14 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-2026-98451",
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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": "2026-09-25T10:25:14.350Z",
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"datePublished": "2026-10-18T15:15:01.473Z",
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"dateUpdated": "2026-10-30T12:38:11.067Z"
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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": "2026-10-30T12:38:11.067Z"
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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: use finish_no_open() for non-regular inodes\n\nAn O_CREAT open can find an existing symlink or another non-regular\ninode. cifs_atomic_open() calls finish_open() on it and attaches a\ncifsFileInfo. Symlink inodes have no CIFS release operation, so the\ndentry reference held by cifsFileInfo is leaked. FMODE_OPENED also\nprevents the VFS from following the symlink.\n\nTrack whether cifs_do_create() returned an open server handle. For\nnon-regular inodes, close the handle if present, remove the pending\nopen, and call finish_no_open() so the VFS can continue the lookup.\nDo not set FMODE_CREATED unless a regular file was opened. For\nO_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's\n-EFTYPE check.\n\nDefer closing a legacy POSIX handle on a non-regular inode until\nafter inode lookup. This avoids closing it again if lookup fails."
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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:R/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 - `openat(O_CREAT)` reaches `cifs_atomic_open()` and `cifs_do_create()`; a remote SMB2 server can return a CREATE/reparse response identifying the object as `IO_REPARSE_TAG_LX_FIFO`, so the causative inode type arrives over routable SMB.\nAC:L - The server can return a FIFO for any fresh, uncached requested name; after the victim's O_CREAT, `finish_open()` and `cifs_new_fileinfo()` deterministically create the type confusion without a race or an uncontrollable precondition.\nPR:N - A malicious SMB endpoint needs no account or capability on the client; the SMB session authenticates the victim outward to the server, which directly controls the CREATE and reparse responses.\nUI:R - The remote server cannot initiate `cifs_atomic_open()` itself; a victim must mount or access its share and issue an O_CREAT open, after which the server can substitute the non-regular inode response.\nS:U - The confused `cifsFileInfo` and resulting pipe operations execute within the vulnerable client's kernel security authority and do not cross a VM, IOMMU, or other security boundary.\nC:H - `cifs_set_ops()` installs `pipefifo_fops`, but `finish_open(..., generic_file_open)` skips `fifo_open()` and `cifs_new_fileinfo()` puts a `cifsFileInfo` in `private_data`; `fifo_pipe_read()` then treats its fields as pipe buffers and pages, creating disclosure-capable type confusion.\nI:H - `pipe_release()` and `pipe_resize_ring()` treat the `cifsFileInfo` as `pipe_inode_info`, modifying fake mutex, counter, waitqueue, and buffer-pointer fields and potentially freeing the misinterpreted `pipe->bufs`, providing kernel-memory corruption primitives.\nA:H - Closing the returned FIFO fd invokes `pipe_release()` on the `cifsFileInfo`; locking its list pointers as a pipe mutex and accessing fake pipe state can immediately oops or hang the kernel, beyond the separate symlink reference leak."
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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/dir.c"
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],
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"versions": [
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{
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"version": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "bc585d5a381ab49cb611c35dda93a997214ca874",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "26f4bca335e719e291995e28dc434de0145a6a54",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "51c7b0593f6eaba05349fd2a01a9cb4df7d7412f",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "045532f920d86dd76600b635f9756e5fd671ddfc",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "ed03d547598c92a036f20e89156540995cac889a",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "70a7918fda54a06d836acc91eb9a3c7e860fe0a0",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "3c07deb26273155c180aedfd9041ab58015d2521",
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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": "d2c127197dfc0b2bae62a52e1e0d3e3ff493919e",
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"lessThan": "e66cf1625ec4a3fe68346119f371def713fd0a4d",
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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/client/dir.c"
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],
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"versions": [
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{
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"version": "3.6",
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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": "3.6",
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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": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.224",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.113",
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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": "6.18.56",
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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": "7.2.9",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "3.6",
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"versionEndExcluding": "5.10.273"
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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": "3.6",
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"versionEndExcluding": "5.15.224"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.6",
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"versionEndExcluding": "6.6.160"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.6",
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"versionEndExcluding": "6.12.113"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.6",
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"versionEndExcluding": "7.2.9"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/bc585d5a381ab49cb611c35dda93a997214ca874"
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},
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{
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"url": "https://git.kernel.org/stable/c/26f4bca335e719e291995e28dc434de0145a6a54"
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},
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{
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"url": "https://git.kernel.org/stable/c/51c7b0593f6eaba05349fd2a01a9cb4df7d7412f"
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},
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{
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"url": "https://git.kernel.org/stable/c/045532f920d86dd76600b635f9756e5fd671ddfc"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed03d547598c92a036f20e89156540995cac889a"
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},
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{
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"url": "https://git.kernel.org/stable/c/70a7918fda54a06d836acc91eb9a3c7e860fe0a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/3c07deb26273155c180aedfd9041ab58015d2521"
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},
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{
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"url": "https://git.kernel.org/stable/c/e66cf1625ec4a3fe68346119f371def713fd0a4d"
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}
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],
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"title": "smb: client: use finish_no_open() for non-regular inodes",
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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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} |