282 lines
15 KiB
JSON
282 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-2025-39718",
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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": "2025-04-16T07:20:57.117Z",
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"datePublished": "2025-09-05T17:21:25.959Z",
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"dateUpdated": "2026-10-15T22:02:30.928Z"
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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": "2026-08-05T12:04:50.190Z"
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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: Validate length in packet header before skb_put()\n\nWhen receiving a vsock packet in the guest, only the virtqueue buffer\nsize is validated prior to virtio_vsock_skb_rx_put(). Unfortunately,\nvirtio_vsock_skb_rx_put() uses the length from the packet header as the\nlength argument to skb_put(), potentially resulting in SKB overflow if\nthe host has gone wonky.\n\nValidate the length as advertised by the packet header before calling\nvirtio_vsock_skb_rx_put()."
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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 attack surface is the virtio-vsock RX virtqueue, which is host/hypervisor-local to the guest rather than network-reachable; vsock carries no routed network traffic. This matches the kernel CNA convention of AV:L for malicious-virtio-backend attacks on guest drivers.\nAC:L - The backend simply writes an arbitrary 32-bit value into the packet header's len field; no race, no memory-layout dependency, and the wraparound window that defeats skb_over_panic() is a fixed, deterministic 44-value range. Every trigger condition is fully under the attacker's control.\nPR:N - No privileges exist in the vulnerable component — the guest kernel — for the attacker to hold; virtio_transport_rx_work() consumes the buffer from a workqueue as soon as the device completes it, with no guest socket, user, or capability involved. Userspace VMMs (Firecracker, crosvm, vhost-user-vsock) are deliberately deprivileged, and under SEV-SNP/TDX/CCA the host is untrusted by design.\nUI:N - The RX work item processes the malicious buffer automatically on device completion, and the vsockmon tap path runs before any socket lookup. No guest user opens a socket, reads data, or performs any action.\nS:U - The vulnerable component and every impacted resource are the guest kernel and its own userspace, which share one security authority. Consistent with the S:U precedent for device→guest virtio driver bugs (CVE-2026-46123, CVE-2026-64456, CVE-2026-64490); S:C in this subsystem has been reserved for guest→host direction.\nC:H - A header len exceeding the bytes the device actually wrote makes skb_put() expose uninitialized kmalloc-8k slab contents, which recvmsg() copies straight to guest userspace, and the u32-wrap case leaves skb->len at ~4 GiB so skb_copy_datagram_iter() reads essentially unbounded guest kernel memory. Repeatable per packet with heap grooming, this is an arbitrary kernel-memory read.\nI:H - The wraparound bypasses skb_over_panic() and leaves a corrupted skb whose len/tail are desynchronized from the allocation; virtio_transport_build_skb() then truncates the size_t allocation size to 75 bytes and performs skb_put_data() of 0xFFFFFFFF, an unbounded out-of-bounds memcpy write out of a small slab object. Combined with the read primitive this is a heap-corruption primitive suitable for control-flow hijack in the guest.\nA:H - Any header len outside the narrow wrap window drives skb->tail past skb->end, hitting skb_over_panic() → BUG() in the virtio_vsock workqueue, and the wrap path instead faults on a multi-gigabyte copy. Either way the guest kernel oopses or panics, triggerable at will and repeatedly."
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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": "baddcc2c71572968cdaeee1c4ab3dc0ad90fa765",
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"lessThan": "969b06bd8b7560efb100a34227619e7d318fbe05",
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{
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"version": "6.1.63",
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"lessThan": "6.1.149",
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"status": "affected",
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"versionType": "semver"
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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": "6.3",
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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": "6.3",
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"status": "unaffected",
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},
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{
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"version": "6.1.149",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.103",
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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": "6.12.44",
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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": "6.16.4",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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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"title": "vsock/virtio: Validate length in packet header before skb_put()",
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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"dateUpdated": "2025-11-03T17:42:44.024Z"
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"dateUpdated": "2026-05-12T12:06:34.737Z"
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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 CN 4100",
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"versions": [
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{
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-39718",
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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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"Technical Impact": "total"
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"title": "CISA ADP Vulnrichment",
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} |