CVE-2026-64552 (GCVE-0-2026-64552)
Vulnerability from cvelistv5
Published
2026-07-27 20:10
Modified
2026-08-17 04:57
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix len check in receive_big() receive_big() bounds the device-announced length by (big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose: add_recvbuf_big() sets sg[1] to start at offset sizeof(struct padded_vnet_hdr) into the first page, so the chain actually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) + big_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the check allows for the common hdr_len == 12 case. A malicious virtio backend can announce a len in that gap. page_to_skb() then walks one frag past the page chain, storing a NULL page->private into skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds write past the static frag array and a NULL frag handed up the rx path. Bound len by the size add_recvbuf_big() actually advertised.
References
Impacted products
Vendor Product Version
Linux Linux Version: 82f9028e83944a9eee5229cbc6fee9be1de8a62d
Version: 946dec89c41726b94d31147ec528b96af0be1b5a
Version: 82fe78065450d2d07f36a22e2b6b44955cf5ca5b
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
Version: 6.1.159   ≤
Version: 6.6.117   ≤
Version: 6.12.58   ≤
Version: 6.17.8   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
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              "version": "7.1.5",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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-\u003eprivate\ninto skb_shinfo()-\u003efrags[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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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 \u2014 it is outside the guest\u0027s 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()-\u003efrags[] array with attacker-influenced index and size, corrupting adjacent slab/page-frag memory \u2014 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:57:29.862Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986"
        },
        {
          "url": "https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"
        }
      ],
      "title": "virtio-net: fix len check in receive_big()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64552",
    "datePublished": "2026-07-27T20:10:40.570Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-08-17T04:57:29.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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