159 lines
9.3 KiB
JSON
159 lines
9.3 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-2025-38413",
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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": "2025-04-16T04:51:24.013Z",
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"datePublished": "2025-07-25T13:20:17.394Z",
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"dateUpdated": "2026-08-05T12:01:42.803Z"
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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": "2026-08-05T12:01:42.803Z"
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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: xsk: rx: fix the frame's length check\n\nWhen calling buf_to_xdp, the len argument is the frame data's length\nwithout virtio header's length (vi->hdr_len). We check that len with\n\n\txsk_pool_get_rx_frame_size() + vi->hdr_len\n\nto ensure the provided len does not larger than the allocated chunk\nsize. The additional vi->hdr_len is because in virtnet_add_recvbuf_xsk,\nwe use part of XDP_PACKET_HEADROOM for virtio header and ask the vhost\nto start placing data from\n\n\thard_start + XDP_PACKET_HEADROOM - vi->hdr_len\nnot\n\thard_start + XDP_PACKET_HEADROOM\n\nBut the first buffer has virtio_header, so the maximum frame's length in\nthe first buffer can only be\n\n\txsk_pool_get_rx_frame_size()\nnot\n\txsk_pool_get_rx_frame_size() + vi->hdr_len\n\nlike in the current check.\n\nThis commit adds an additional argument to buf_to_xdp differentiate\nbetween the first buffer and other ones to correctly calculate the maximum\nframe's length."
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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:N/A:H",
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"baseScore": 7.7,
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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 malicious input is the used-ring length reported by the virtio-net backend (untrusted hypervisor/host, vDPA/VDUSE backend, or virtio offload hardware), which is local to the guest kernel rather than delivered over the network. A remote network peer cannot trigger it, since a conforming backend can never report more bytes than the posted buffer holds.\nAC:L - The backend fully and deterministically controls the reported length field and can set it to `frame_size + 2*hdr_len` on every received packet; there is no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:N - The attacking device backend needs no credentials or privileges inside the target guest — the overflow is processed automatically in the virtio-net NAPI RX path with no guest-side authentication or capability check.\nUI:N - No victim action is required; the malformed length is consumed by `virtnet_receive_xsk_buf()` during normal NAPI packet reception once an AF_XDP zero-copy pool is bound to the queue.\nS:U - The out-of-bounds read and the resulting disclosure/crash are confined to the guest kernel that owns the vulnerable driver, so the vulnerable and impacted components share the same security authority.\nC:H - `xdp->data_end` is pushed past the end of the XSK chunk, and `xsk_construct_skb()`/`xsk_append_merge_buffer()` copy that out-of-bounds memory into an skb that is delivered to the guest network stack or retransmitted via XDP_TX/XDP_REDIRECT, leaking adjacent memory repeatedly at packet rate.\nI:N - Both copy destinations (`napi_alloc_skb()` and `napi_alloc_frag()`) are sized from the same inflated length that is copied, so no out-of-bounds write or kernel data modification occurs — the defect is a read-side bounds error only.\nA:H - The umem is a `vmap()` of pinned user pages, so reading past the final chunk lands on a vmalloc guard page and produces an unhandled kernel page fault/oops (and a KASAN BUG on hardened kernels), crashing the guest."
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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/net/virtio_net.c"
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],
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"versions": [
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{
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"version": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
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"lessThan": "892f6ed9a4a38bb3360fdff091b9241cfa105b61",
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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": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
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"lessThan": "6013bb6bc24c2cac3f45b37a15b71b232a5b00ff",
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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": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
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"lessThan": "5177373c31318c3c6a190383bfd232e6cf565c36",
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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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"drivers/net/virtio_net.c"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.37",
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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": "6.15.6",
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"lessThanOrEqual": "6.15.*",
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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": "6.16",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.12.37"
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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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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.15.6"
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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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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.16"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/892f6ed9a4a38bb3360fdff091b9241cfa105b61"
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},
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{
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"url": "https://git.kernel.org/stable/c/6013bb6bc24c2cac3f45b37a15b71b232a5b00ff"
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},
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{
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"url": "https://git.kernel.org/stable/c/5177373c31318c3c6a190383bfd232e6cf565c36"
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}
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],
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"title": "virtio-net: xsk: rx: fix the frame's length check",
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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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}
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} |