319 lines
16 KiB
JSON
319 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-2026-46065",
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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": "2026-05-13T15:03:33.095Z",
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"datePublished": "2026-05-27T12:57:32.968Z",
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"dateUpdated": "2026-10-19T19:26:42.635Z"
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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": "2026-08-05T12:29:27.785Z"
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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\nfbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info\n\nHold state of deferred I/O in struct fb_deferred_io_state. Allocate an\ninstance as part of initializing deferred I/O and remove it only after\nthe final mapping has been closed. If the fb_info and the contained\ndeferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info\nto invalidate the mapping. Any access will then result in a SIGBUS\nsignal.\n\nFixes a long-standing problem, where a device hot-unplug happens while\nuser space still has an active mapping of the graphics memory. The hot-\nunplug frees the instance of struct fb_info. Accessing the memory will\noperate on undefined state."
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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 vulnerable fault handlers are reached by mmap'ing /dev/fbN and accessing the mapping — a local operation requiring no network. Device removal (the precondition) can be non-physical (VM host-driven removal, sysfs unbind, module unload), so Local is the most severe defensible vector over Physical.\nAC:L - Once the device is removed while a mapping is active, any access deterministically hits the freed defio state/video pages — no race must be won to trigger it. In a kiosk/embedded scenario with a removable display the attacker controls both the mapping and the removal, and heap reclaim is attacker-influenced.\nPR:L - Exploitation requires only a local user with access to the framebuffer device, which is granted to the logged-in/console user, video-group members, Android apps, and is often world-accessible on embedded/kiosk systems. No root or init-namespace privilege is needed.\nUI:N - The attacker performs all steps themselves — map the framebuffer, cause/await removal, then access the mapping — with no separate victim action required.\nS:U - The use-after-free corrupts kernel memory within the same security authority; even in the VM-framebuffer case the impact stays inside the guest kernel and does not cross into the hypervisor.\nC:H - The fault handler returns freed-and-reclaimed video pages and the freed pagerefs array to userspace, allowing disclosure of arbitrary reallocated kernel/user memory — a use-after-free read primitive.\nI:H - The write-fault path writes a page pointer and offset into the kvfree'd pagerefs array and exposes freed/reallocated pages for writing, giving a use-after-free write primitive usable for control-flow hijacking via heap spraying.\nA:H - Accessing the mapping after teardown uses a destroyed mutex, freed pagerefs, and hits BUG_ON(!info->fbdefio->mapping), reliably causing an oops/panic; any use-after-free crashes 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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"drivers/video/fbdev/core/fb_defio.c",
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"include/linux/fb.h"
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],
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"versions": [
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{
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"version": "60b59beafba875aef6d378078bce0baf2287ae14",
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"lessThan": "4aab89603b637a2e441b38808c4f6fe7d1184df6",
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"status": "affected",
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"versionType": "git"
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},
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"version": "60b59beafba875aef6d378078bce0baf2287ae14",
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"lessThan": "4fda0d6b45faad44926dd3e4f55f118d899b2e27",
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"status": "affected",
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},
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"status": "affected",
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"status": "affected",
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{
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"version": "60b59beafba875aef6d378078bce0baf2287ae14",
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"status": "affected",
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"version": "60b59beafba875aef6d378078bce0baf2287ae14",
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"lessThan": "9ded47ad003f09a94b6a710b5c47f4aa5ceb7429",
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"status": "affected",
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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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"drivers/video/fbdev/core/fb_defio.c",
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"include/linux/fb.h"
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],
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"versions": [
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{
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"version": "2.6.22",
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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": "2.6.22",
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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": "5.15.210",
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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": "6.1.176",
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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": "6.6.140",
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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": "6.12.88",
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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": "6.18.30",
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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": "7.0.4",
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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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"operator": "OR",
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"versionEndExcluding": "5.15.210"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066"
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{
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"url": "https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db"
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{
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"url": "https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70"
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{
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"url": "https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429"
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}
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],
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"title": "fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info",
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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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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:20:19.593Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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}
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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}
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]
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},
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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-2026-46065",
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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": "2026-10-16T15:19:22.528676Z"
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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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"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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"dateUpdated": "2026-10-19T19:26:42.635Z"
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]
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}
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} |