284 lines
15 KiB
JSON
284 lines
15 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-2026-68381",
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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": "2026-07-30T09:28:09.387Z",
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"datePublished": "2026-08-10T12:03:59.849Z",
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"dateUpdated": "2026-10-30T12:28:25.660Z"
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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": "2026-10-30T12:28:25.660Z"
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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: pin conn during async oplock break notification\n\nsmb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn\npointer in an async ksmbd_work and then queue that work on ksmbd-io. The\nwork only increments conn->r_count, which prevents teardown from passing\nthe pending-request wait after the increment, but it does not pin the\nstruct ksmbd_conn object.\n\nIf connection teardown races with an oplock break notification, the last\nconn reference can be dropped before the queued worker finishes. The\nworker then uses the freed conn in ksmbd_conn_write() and\nksmbd_conn_r_count_dec().\n\nTake a real conn reference when publishing the conn pointer to the async\nwork item, and drop it after the notification work has decremented\nr_count. Apply the same lifetime rule to lease break notification, which\nuses the same work->conn pattern."
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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 the in-kernel SMB server listening on TCP/445 (and SMB-Direct); the oplock/lease break notification path is driven entirely by remote SMB2 CREATE/close traffic and connection teardown, so a remote peer reaches the freed-conn use over the network.\nAC:L - The attacker controls both sides of the race: one connection holds a batch oplock/lease while a second connection opens the same file to force the async break, and the first connection is then abruptly dropped so teardown passes the r_count wait before the increment lands; this can be retried across arbitrarily many connections.\nPR:N - ksmbd share access is commonly exposed with guest/anonymous mapping, so an unauthenticated or trivially-credentialed remote client can open files and trigger oplock/lease breaks; consistent with prior ksmbd connection-lifetime UAF scoring, no meaningful privilege gate protects this path.\nUI:N - No victim action is needed; the attacker's own two SMB connections create the oplock break and the racing disconnect entirely on their own initiative.\nS:U - The freed object and the corrupted state are both kernel memory owned by the ksmbd server within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free of struct ksmbd_conn lets the attacker reclaim the slab object with attacker-shaped data and have the worker read conn->transport and response state from it, enabling disclosure of kernel memory and pointer values, potentially leaked back over the SMB connection.\nI:H - ksmbd_conn_write() dereferences conn->transport->ops->writev from the freed object and indirectly calls it, and ksmbd_conn_lock()/ksmbd_conn_r_count_dec() perform mutex and atomic/waitqueue writes into freed memory, giving heap-spray-based control-flow hijack and arbitrary-write potential.\nA:H - Even without successful exploitation, using a freed ksmbd_conn (mutex operations, transport pointer dereference, waitqueue wakeup) reliably causes memory corruption, oops, or kernel panic, taking down the whole system."
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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/oplock.c"
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],
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"versions": [
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{
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"version": "8e6508c7ecb1802909f294827eff38f301d0c937",
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"lessThan": "dab1493bc9d97947f1219d6823c2e2a28636021b",
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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": "09aeab68033161cb54f194da93e51a11aee6144b",
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"lessThan": "0f72fc9659d7f585460d43c158055df5afdcffb6",
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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": "a4261bbc33fbf99b99c80aa3a2c5097611802980",
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"lessThan": "793e1c7041b93af96ff87e678329bc16aee7ba88",
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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": "3aa660c059240e0c795217182cf7df32909dd917",
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"lessThan": "6ecb252efa0b413ac3d9979fb4eec247f8fc1258",
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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": "3aa660c059240e0c795217182cf7df32909dd917",
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"lessThan": "14062c74e5b25c27edcff7a2fe0dc701c930b372",
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"status": "affected",
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"versionType": "git"
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},
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"version": "3aa660c059240e0c795217182cf7df32909dd917",
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"lessThan": "aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9",
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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": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa",
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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": "6.6.84",
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"lessThan": "6.6.148",
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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": "6.12.20",
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"lessThan": "6.12.101",
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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": "6.13.8",
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"lessThan": "6.14",
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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/oplock.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.6",
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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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{
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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": "6.6.84",
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"versionEndExcluding": "6.6.148"
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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/dab1493bc9d97947f1219d6823c2e2a28636021b"
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},
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{
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"url": "https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6"
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},
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{
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"url": "https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88"
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},
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{
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"url": "https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258"
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},
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{
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"url": "https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9"
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}
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],
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"title": "ksmbd: pin conn during async oplock break notification",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-68381",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:47:40.959770Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T21:09:06.923Z"
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}
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}
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]
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}
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} |