Vulnerability-Lookup

CVE-2026-64552 (GCVE-0-2026-64552)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10

Title

virtio-net: fix len check in receive_big()

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.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/f9451d0fd5ba635dc…
https://git.kernel.org/stable/c/38e94d63e29f4a5c6…
https://git.kernel.org/stable/c/fbeb65154583879d5…
https://git.kernel.org/stable/c/c7fc9adf4e006155f…
https://git.kernel.org/stable/c/e6b8463b7d791f388…
https://git.kernel.org/stable/c/9e5ad06ea826322ce…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 82f9028e83944a9eee5229cbc6fee9be1de8a62d , < f9451d0fd5ba635dcabb49bfe456a6db734a8986 (git) Affected: 946dec89c41726b94d31147ec528b96af0be1b5a , < 38e94d63e29f4a5c6eae87ee2c02101aaa321502 (git) Affected: 82fe78065450d2d07f36a22e2b6b44955cf5ca5b , < fbeb65154583879d556ea94cb2f15888e9470f3d (git) Affected: 0c716703965ffc5ef4311b65cb5d84a703784717 , < c7fc9adf4e006155f7f2aeda052fbcde25cdcc49 (git) Affected: 0c716703965ffc5ef4311b65cb5d84a703784717 , < e6b8463b7d791f3886d7584259d6e9f06a69f12e (git) Affected: 0c716703965ffc5ef4311b65cb5d84a703784717 , < 9e5ad06ea826322ce8c58b4a68442a96f600c3c4 (git) Affected: 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 (git) Affected: 6.1.159 , < 6.1.178 (semver) Affected: 6.6.117 , < 6.6.145 (semver) Affected: 6.12.58 , < 6.12.97 (semver) Affected: 6.17.8 , < 6.18 (semver)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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      "providerMetadata": {
        "dateUpdated": "2026-07-27T20:10:40.570Z",
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    "datePublished": "2026-07-27T20:10:40.570Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-07-27T20:10:40.570Z",
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  }
}

GHSA-6C34-77J2-7G8C

Vulnerability from github – Published: 2026-07-27 21:31 – Updated: 2026-07-27 21:31

Details

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.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64552"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-27T21:17:08Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-6c34-77j2-7g8c",
  "modified": "2026-07-27T21:31:27Z",
  "published": "2026-07-27T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64552"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64552 (GCVE-0-2026-64552)

GHSA-6C34-77J2-7G8C

Tags

Sightings

Nomenclature