269 lines
13 KiB
JSON
269 lines
13 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-2021-47352",
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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": "2024-05-21T14:28:16.985Z",
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"datePublished": "2024-05-21T14:35:56.473Z",
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"dateUpdated": "2026-08-05T08:47:24.845Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:24.845Z"
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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\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."
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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 used length is taken from the virtio used ring written by the device backend (hypervisor/vhost/VDUSE), not from packet payload, so a remote network peer cannot forge it; exploitation requires a locally attached malicious virtio-net device.\nAC:L - The attacker fully controls the used-ring length field and can reliably supply an oversized value on every completed RX buffer with no race or other conditions outside their control.\nPR:N - No privileges on the victim guest are required; a malicious virtio backend can kick the RX virtqueue and the NAPI path in receive_small/receive_mergeable processes the forged length automatically.\nUI:N - Exploitation occurs entirely in the automatic softirq/NAPI receive path when the device completes buffers; no user action is needed.\nS:U - Impact is confined to the guest kernel that runs the virtio-net driver; this is host/device-to-guest corruption within that OS authority, not a guest-to-host or cross-VM escape.\nC:H - An oversized used length can overlap skb_shared_info or drive XDP with a past-the-end data_end, yielding out-of-bounds reads of adjacent kernel memory; memory-corruption bugs of this class are scored C:H.\nI:H - The same oversized length enables skb_shared_info / buffer corruption and XDP out-of-bounds writes before the post-XDP mergeable check, which is exploitable for integrity compromise and control-flow hijacking as the fix notes (data corruption).\nA:H - Lengths beyond skb tailroom hit skb_over_panic, and corrupted RX/sk_buff state can oops or panic the guest kernel, so availability impact is High."
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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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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/net/virtio_net.c"
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],
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"versions": [
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{
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"version": "4.11",
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{
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"version": "0",
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"lessThan": "4.11",
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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": "5.4.293",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.51",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.12.18",
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"lessThanOrEqual": "5.12.*",
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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": "5.13.3",
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"lessThanOrEqual": "5.13.*",
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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": "5.14",
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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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