207 lines
11 KiB
JSON
207 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-2026-31718",
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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": "2026-03-09T15:48:24.134Z",
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"datePublished": "2026-05-01T13:56:12.680Z",
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"dateUpdated": "2026-08-05T12:24:49.667Z"
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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": "2026-08-05T12:24:49.667Z"
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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 use-after-free in __ksmbd_close_fd() via durable scavenger\n\nWhen a durable file handle survives session disconnect (TCP close without\nSMB2_LOGOFF), session_fd_check() sets fp->conn = NULL to preserve the\nhandle for later reconnection. However, it did not clean up the byte-range\nlocks on fp->lock_list.\n\nLater, when the durable scavenger thread times out and calls\n__ksmbd_close_fd(NULL, fp), the lock cleanup loop did:\n\n spin_lock(&fp->conn->llist_lock);\n\nThis caused a slab use-after-free because fp->conn was NULL and the\noriginal connection object had already been freed by\nksmbd_tcp_disconnect().\n\nThe root cause is asymmetric cleanup: lock entries (smb_lock->clist) were\nleft dangling on the freed conn->lock_list while fp->conn was nulled out.\n\nTo fix this issue properly, we need to handle the lifetime of\nsmb_lock->clist across three paths:\n - Safely skip clist deletion when list is empty and fp->conn is NULL.\n - Remove the lock from the old connection's lock_list in\n session_fd_check()\n - Re-add the lock to the new connection's lock_list in\n ksmbd_reopen_durable_fd()."
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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 is an in-kernel SMB server reachable over TCP/IP, and the vulnerable durable-handle and byte-range-lock paths are driven by SMB2 network requests.\nAC:L - The attacker can create the durable handle, add a lock, disconnect TCP without SMB2_LOGOFF, and wait for the durable scavenger; no race or condition outside attacker control is required.\nPR:N - The path requires an SMB session and tree connection, but ksmbd supports guest/anonymous sessions and guest shares, making a no-credential network attack a reasonable high-severity deployment scenario.\nUI:N - No victim interaction is required once the ksmbd service is exposed; the attacker sends SMB2 requests and closes the connection.\nS:U - The bug corrupts kernel/ksmbd state within the same security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a kernel use-after-free involving dangling list entries tied to freed connection state, and such memory corruption can plausibly be shaped into kernel memory disclosure.\nI:H - The same UAF/list corruption can plausibly be leveraged for kernel memory corruption or control-flow impact, so high integrity impact is warranted.\nA:H - At minimum, triggering the scavenger cleanup can dereference freed or invalid connection/list state and crash the kernel."
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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/vfs_cache.c"
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],
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"versions": [
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{
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"version": "8df4bcdb0a4232192b2445256c39b787d58ef14d",
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"lessThan": "0000a7780e0e446a28a273572f6ea8f7f582f694",
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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": "c8efcc786146a951091588e5fa7e3c754850cb3c",
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"lessThan": "e33c65f011980b4ad4abfd93585ec2079856368f",
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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": "c8efcc786146a951091588e5fa7e3c754850cb3c",
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"lessThan": "3d6682726c2d3a46d31dae88b8166786b09b03ad",
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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": "c8efcc786146a951091588e5fa7e3c754850cb3c",
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"lessThan": "b34fc42cfe922e551f7a27d3ac3bb016e41d7dd9",
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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": "c8efcc786146a951091588e5fa7e3c754850cb3c",
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"lessThan": "235e32320a470fcd3998fb3774f2290a0eb302a1",
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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": "6.6.32",
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"lessThan": "6.6.140",
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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/vfs_cache.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.6.140",
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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": "6.12.84",
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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": "6.18.25",
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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": "7.0.2",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "6.6.32",
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"versionEndExcluding": "6.6.140"
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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": "6.9",
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"versionEndExcluding": "6.12.84"
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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": "6.9",
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"versionEndExcluding": "6.18.25"
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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": "6.9",
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"versionEndExcluding": "7.0.2"
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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": "6.9",
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"versionEndExcluding": "7.1"
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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/0000a7780e0e446a28a273572f6ea8f7f582f694"
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},
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{
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"url": "https://git.kernel.org/stable/c/e33c65f011980b4ad4abfd93585ec2079856368f"
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},
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{
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"url": "https://git.kernel.org/stable/c/3d6682726c2d3a46d31dae88b8166786b09b03ad"
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},
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{
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"url": "https://git.kernel.org/stable/c/b34fc42cfe922e551f7a27d3ac3bb016e41d7dd9"
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},
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{
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"url": "https://git.kernel.org/stable/c/235e32320a470fcd3998fb3774f2290a0eb302a1"
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}
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],
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"title": "ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger",
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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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} |