270 lines
15 KiB
JSON
270 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-2026-64401",
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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": "2026-07-19T15:36:31.785Z",
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"datePublished": "2026-07-25T08:50:44.361Z",
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"dateUpdated": "2026-10-19T20:38:26.985Z"
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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": "2026-08-17T04:54:59.017Z"
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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: resolve SWN tcon from live registrations\n\ncifs_swn_notify() looks up a witness registration by id under\ncifs_swnreg_idr_mutex, drops the mutex, and then uses the registration's\ncached tcon pointer. That pointer is not a lifetime reference, and it is\nnot a stable representative once cifs_get_swn_reg() lets multiple tcons\nfor the same net/share name share one registration id.\n\nA same-share second mount can keep the cifs_swn_reg alive after the first\ntcon unregisters and is freed. The registration then still points at the\nfreed first tcon, so taking tc_lock or incrementing tc_count through\nswnreg->tcon only moves the use-after-free earlier. Taking tc_lock while\nholding cifs_swnreg_idr_mutex also violates the documented CIFS lock\norder.\n\nFix this by making the registration store only the stable witness\nidentity: id, net name, share name, and notify flags. When a notify\narrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex,\nthen find and pin a live witness tcon that currently matches the net/share\npair under the normal cifs_tcp_ses_lock -> tc_lock order. The notification\npath uses that pinned tcon directly and drops the reference when done.\n\nRegistration and unregister messages now use the live tcon passed by the\ncaller instead of a cached tcon in the registration. The final unregister\nsend is folded into cifs_swn_unregister() while the registration is still\nprotected by cifs_swnreg_idr_mutex. This removes the previous\nfind/drop/reacquire raw-pointer window. The release path only removes the\nidr entry and frees the stable identity strings.\n\nThis preserves the intended one-registration/many-tcon behavior: a\nregistration id represents a net/share pair, and notify handling acts on a\nlive representative selected at use time. It also preserves CLIENT_MOVE\nordering for the representative tcon because the old-IP unregister is sent\nbefore cifs_swn_register() sends the new-IP register."
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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:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The UAF is locally reachable through the world-readable /proc/fs/cifs/DebugData path and, on earlier affected kernels, unrestricted SWN generic-netlink notifications.\nAC:L - A same-share second mount deterministically preserves the registration after the first tcon is freed; repeated proc reads or notifications then dereference the stale pointer without requiring an uncontrollable race.\nPR:L - An unprivileged local user can read /proc/fs/cifs/DebugData, and affected kernels predating the companion netlink authorization fix also allowed unprivileged SWN_NOTIFY messages. User namespaces do not grant CIFS mount authority, but no mount privilege is needed once normal mount turnover creates the stale registration.\nUI:N - Once a witness-enabled registration exists, exploitation requires no further victim action; the attacker can invoke the local trigger directly.\nS:U - Successful exploitation compromises the host kernel within the same security authority and does not inherently cross a VM, IOMMU, or other scope boundary.\nC:H - The heap UAF involves attacker-reclaimable cifs_tcon and cifs_swn_reg objects whose pointer chains reach session credentials and arbitrary kernel memory, enabling high-impact disclosure primitives.\nI:H - Reclaiming the freed objects can redirect client-move and reconnect operations through attacker-influenced pointers, providing arbitrary-write and control-flow-hijacking potential.\nA:H - Dereferencing the freed tcon or registration can cause an immediate kernel oops or panic, and the periodic echo worker can repeatedly exercise the stale pointer."
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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/cifs_swn.c",
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"fs/smb/client/trace.h"
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],
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"versions": [
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "51d18db392e5386a7bb9e816d611f14e600cca3c",
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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": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd",
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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": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "945b4a4a54497db1dcb2f20ef801a84e884dac21",
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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": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "91b8a58c6ac15c7db6518f696389933282f88da7",
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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": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "0700f946659d0ab2352ec8a9b1c6fc74b13a27d7",
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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": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "ec457f9afe5ae9538bdcd58fd4cb442b9787e183",
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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/cifs_swn.c",
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"fs/smb/client/trace.h"
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],
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"versions": [
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{
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"version": "5.11",
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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": "5.11",
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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": "6.1.178",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.39",
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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": "7.1.4",
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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": "5.11",
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"versionEndExcluding": "6.1.178"
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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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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/51d18db392e5386a7bb9e816d611f14e600cca3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/945b4a4a54497db1dcb2f20ef801a84e884dac21"
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},
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{
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"url": "https://git.kernel.org/stable/c/91b8a58c6ac15c7db6518f696389933282f88da7"
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},
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{
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"url": "https://git.kernel.org/stable/c/0700f946659d0ab2352ec8a9b1c6fc74b13a27d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec457f9afe5ae9538bdcd58fd4cb442b9787e183"
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}
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],
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"title": "smb: client: resolve SWN tcon from live registrations",
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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-2026-64401",
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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": "2026-10-16T15:40:09.874857Z"
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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": "2026-10-19T20:38:26.985Z"
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}
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}
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]
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}
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} |