450 lines
22 KiB
JSON
450 lines
22 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-2026-64552",
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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": "2026-07-19T15:36:31.796Z",
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"datePublished": "2026-07-27T20:10:40.570Z",
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"dateUpdated": "2026-11-10T12:49:31.438Z"
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},
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"dateUpdated": "2026-08-17T04:57:29.862Z"
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},
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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: fix len check in receive_big()\n\nreceive_big() bounds the device-announced length by\n(big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose:\nadd_recvbuf_big() sets sg[1] to start at offset\nsizeof(struct padded_vnet_hdr) into the first page, so the chain\nactually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) +\nbig_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the\ncheck allows for the common hdr_len == 12 case.\n\nA malicious virtio backend can announce a len in that gap. page_to_skb()\nthen walks one frag past the page chain, storing a NULL page->private\ninto skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds\nwrite past the static frag array and a NULL frag handed up the rx path.\n\nBound len by the size add_recvbuf_big() actually advertised."
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}
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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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"value": "AV:L - The malicious input is the buffer length announced by the virtio backend (hypervisor, vhost-user/VDUSE daemon, or virtio-net hardware device), not data from a network peer; a conforming backend can never announce a length in the vulnerable gap. This is the local device-to-driver attack surface, matching how other malicious-virtio-device bugs are scored.\nAC:L - The backend deterministically controls feature negotiation, MTU (hence big_packets_num_skbfrags), and the announced len, so it can force big-packets mode and hit the 20-byte gap on the first packet with no race or memory-layout luck.\nPR:N - The attacking backend requires no credentials or privileges inside the victim kernel — it is outside the guest's security authority and simply completes an RX descriptor. No guest-side account is needed.\nUI:N - Triggered automatically in the NAPI receive path as soon as the backend completes a receive buffer; no victim action is required.\nS:U - The corruption and crash are confined to the kernel that owns the virtio-net driver, with no crossing into a different security-managing authority such as an IOMMU or hypervisor boundary.\nC:H - A controlled 16-byte out-of-bounds write past skb_shared_info into an adjacent skb head in the NAPI page-frag cache lets the attacker corrupt neighbouring network buffer metadata, which is leverageable to disclose adjacent kernel memory; nr_frags is also left one past MAX_SKB_FRAGS so downstream code reads out-of-bounds frag state.\nI:H - This is an out-of-bounds write past the end of the static skb_shinfo()->frags[] array with attacker-influenced index and size, corrupting adjacent slab/page-frag memory — per guidance an OOB write is High and is potentially leverageable for control-flow hijack.\nA:H - After the OOB write, a NULL page is stored as a frag and immediately dereferenced via compound_head() in softirq context, producing a guaranteed kernel oops; the backend can repeat this at will."
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}
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