310 lines
16 KiB
JSON
310 lines
16 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-2026-68140",
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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": "2026-07-30T09:28:09.370Z",
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"datePublished": "2026-08-10T11:59:03.761Z",
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"dateUpdated": "2026-10-19T20:58:53.121Z"
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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": "2026-08-19T16:29:57.127Z"
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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\nnet/iucv: fix use-after-free of a severed iucv_path\n\naf_iucv queues not-yet-received message notifications on iucv->message_q,\neach holding a raw pointer to the connection's iucv_path. When the peer\nsevers the connection, iucv_sever_path() frees that path with\niucv_path_free() but leaves the notifications queued. A later recvmsg()\ndrains message_q via iucv_process_message_q() and hands the stale path to\nmessage_receive() -- a use-after-free of the freed iucv_path.\n\nDrop the queued notifications when the path is severed; once the path is\ngone they can no longer be received. This also frees the notifications\nleaked when a socket is closed with messages still queued."
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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:A/AC:L/PR:N/UI:N/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:A - An adjacent z/VM guest or LPAR peer can establish an AF_IUCV connection and deliver IUCV message_pending and path_severed events to a victim; exploitation requires same-CPC IUCV reachability, not Internet-wide access.\nAC:L - The attacker deterministically floods IUCV messages to fill message_q, severs the connection to free iucv_path, then victim recvmsg() drains the stale queue; no uncontrollable timing or memory-layout luck is required.\nPR:N - On the victim, no local Linux account or capability is needed; any unauthorized adjacent IUCV peer that completes the AF_IUCV handshake can flood messages and sever the path against a listening service.\nUI:N - No special victim action is required beyond normal server recvmsg() on an established IUCV session; the attacker drives connection setup, message flood, and path sever entirely from the peer side.\nS:U - Impact is kernel memory corruption within the victim Linux guest; it does not cross hypervisor, VM-escape, or IOMMU security boundaries.\nC:H - Queued notifications dereference a freed struct iucv_path in message_receive(), passing stale pathid and private fields into CP IUCV RECEIVE calls—a classic UAF enabling attacker-controlled heap reuse and kernel memory disclosure.\nI:H - Use-after-free of iucv_path lets an attacker reclaim the freed object and supply forged pathid and list pointers used by __iucv_message_receive(), providing heap corruption primitives suitable for arbitrary kernel write or code execution.\nA:H - Processing the stale path in iucv_process_message_q() dereferences freed kernel memory during message_receive(), reliably causing kernel oops or panic and total loss of availability even before full exploitation."
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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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"net/iucv/af_iucv.c"
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],
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"versions": [
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{
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"version": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "5f08c5e50bcb4680069bd3f9edd5728308816ded",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "c24faf11bd31bfe0500aca12cbdd5a573a954a5d",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "99ddb33748698296a6f17b9b34aa3d16a406bb3c",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "23658b350b4107e8292045c2044983fd426fa15d",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "a5bbaddf69853117f28173c3f5c8fc14c6b2ec82",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "900cd6d8119b7f3ae5c4bf82f922ff5957df43db",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "f579582c03ed526281a8450159baf1d35099a85f",
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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": "f0703c80e5156406ad947cb67fe277725b48080f",
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"lessThan": "be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a",
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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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"net/iucv/af_iucv.c"
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],
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"versions": [
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{
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"version": "2.6.24",
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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": "2.6.24",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.148",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.24",
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"versionEndExcluding": "5.10.265"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "7.1.6"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5f08c5e50bcb4680069bd3f9edd5728308816ded"
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},
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{
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"url": "https://git.kernel.org/stable/c/c24faf11bd31bfe0500aca12cbdd5a573a954a5d"
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},
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{
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"url": "https://git.kernel.org/stable/c/99ddb33748698296a6f17b9b34aa3d16a406bb3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/23658b350b4107e8292045c2044983fd426fa15d"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5bbaddf69853117f28173c3f5c8fc14c6b2ec82"
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},
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{
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"url": "https://git.kernel.org/stable/c/900cd6d8119b7f3ae5c4bf82f922ff5957df43db"
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},
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{
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"url": "https://git.kernel.org/stable/c/f579582c03ed526281a8450159baf1d35099a85f"
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},
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{
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"url": "https://git.kernel.org/stable/c/be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a"
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}
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],
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"title": "net/iucv: fix use-after-free of a severed iucv_path",
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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-2026-68140",
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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": "no"
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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": "2026-10-16T15:44:34.964555Z"
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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": "2026-10-19T20:58:53.121Z"
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}
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}
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]
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}
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} |