298 lines
16 KiB
JSON
298 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-2026-80932",
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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": "2026-08-26T14:34:25.802Z",
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"datePublished": "2026-09-11T19:42:07.012Z",
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"dateUpdated": "2026-10-19T08:45:16.044Z"
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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": "2026-10-19T08:45:16.044Z"
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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\nvsock/virtio: flush works in dependency order\n\nvirtio_vsock_remove() stops the virtqueues and then flushes each work\nitem before freeing the enclosing virtio_vsock. The current order does\nnot account for dependencies between those items: tx_work may queue\nsend_pkt_work, and send_pkt_work may queue rx_work.\n\nIn particular, send_pkt_work can set restart_rx and release tx_lock.\nThe remove path can then stop the queues and flush rx_work before\nsend_pkt_work queues it. Although the later send_pkt_work flush waits\nfor that producer to finish, nothing waits for the newly queued rx_work,\nso kfree(vsock) can race with it.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in\n virtio_transport_rx_work+0x487/0x4b0\n Read of size 8 at addr ffff888114c2b008 by task kworker/1:1/47\n Workqueue: virtio_vsock virtio_transport_rx_work\n Call Trace:\n virtio_transport_rx_work+0x487/0x4b0\n process_one_work+0x688/0x1120\n worker_thread+0x45b/0xd10\n Allocated by task 1:\n virtio_vsock_probe+0xef/0x6b0\n Freed by task 84:\n kfree+0x131/0x3c0\n virtio_vsock_remove+0xd1/0x100\n\nFlush the works in producer-to-consumer order. virtio_vsock_vqs_del()\nhas already disabled the queue callbacks and cleared the run flags, so\nafter tx_work and send_pkt_work are drained, no source remains that can\nqueue rx_work after its flush."
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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:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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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 bug is in the guest virtio-vsock driver during virtio_vsock_remove(), reached via virtio device unplug and AF_VSOCK virtqueue completions rather than routed packets; kernel CNA guidance scores vsock and virtio guest-driver bugs as Local.\nAC:L - A malicious hypervisor controls both sides of the race by injecting vsock packets that generate RST replies so send_pkt_work sets restart_rx and queues rx_work, while concurrently hot-unplugging the device so remove() flushes rx_work too early; the attacker can retry and pause guest vCPUs, so success is not an uncontrolled condition.\nPR:N - No guest privileges are required: a malicious hypervisor or deprivileged VMM (Firecracker, crosvm, TDX/SEV-SNP) triggers device removal and virtqueue traffic with no guest credentials; host-sent packets to unbound ports generate reply skbs in kernel workqueues without any guest socket, user, or capability.\nUI:N - virtio_vsock_remove() and the racing send_pkt_work/rx_work items run from driver teardown and virtqueue IRQ workqueues; no guest user must mount a filesystem, open a device, or take any other action.\nS:U - The use-after-free corrupts the guest kernel virtio_vsock object and remains within the guest OS security authority; a guest-to-host escape would require a host vhost-vsock bug, not this guest-side remove path.\nC:H - KASAN reports a slab use-after-free read in virtio_transport_rx_work of the kfree'd virtio_vsock; a workqueue callback running on a freed slab object enables attacker-controlled reuse and arbitrary kernel memory disclosure.\nI:H - After kfree(vsock), pending rx_work still runs against the freed object (rx_lock, vqs, flags); slab reuse of that work_struct yields arbitrary writes and control-flow hijack typical of kernel workqueue UAFs, not merely a crash.\nA:H - The reported KASAN bug is a kernel slab-use-after-free in virtio_transport_rx_work during device removal, causing oops or panic and fully denying guest availability even without completing a privilege-escalation exploit."
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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/vmw_vsock/virtio_transport.c"
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],
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"versions": [
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{
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"version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "e059a14c1067bcc4f7b1947cd09f2baab98e340f",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "531e2ac2dab1ab90a16427c4f9c86663633e9487",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "f3313d952fc380cff53db9a28451a8807aa67b43",
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"status": "affected",
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{
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"version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "2187a56f2fd1715d54daed6392809223c60544f3",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "165a330a68b5f299d8735f0194c314cb2e571269",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "da5e9f08714c19ba04e6863aca69d40f042f2e04",
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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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872",
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"lessThan": "728836ebca239810f164262b10211ef59182f811",
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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/vmw_vsock/virtio_transport.c"
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],
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"versions": [
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{
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"version": "4.8",
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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": "4.8",
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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": "5.10.270",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.109",
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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": "6.18.50",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "4.8",
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"versionEndExcluding": "5.10.270"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e059a14c1067bcc4f7b1947cd09f2baab98e340f"
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},
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{
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"url": "https://git.kernel.org/stable/c/531e2ac2dab1ab90a16427c4f9c86663633e9487"
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},
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{
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"url": "https://git.kernel.org/stable/c/f3313d952fc380cff53db9a28451a8807aa67b43"
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},
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{
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"url": "https://git.kernel.org/stable/c/b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94"
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},
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{
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"url": "https://git.kernel.org/stable/c/2187a56f2fd1715d54daed6392809223c60544f3"
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},
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{
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"url": "https://git.kernel.org/stable/c/165a330a68b5f299d8735f0194c314cb2e571269"
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},
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{
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"url": "https://git.kernel.org/stable/c/da5e9f08714c19ba04e6863aca69d40f042f2e04"
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},
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{
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"url": "https://git.kernel.org/stable/c/728836ebca239810f164262b10211ef59182f811"
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}
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],
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"title": "vsock/virtio: flush works in dependency order",
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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-2026-80932",
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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": "2026-10-16T19:21:23.480878Z"
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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": "2026-10-16T19:26:36.468Z"
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}
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}
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]
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}
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} |