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

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-09-08 08:50
VLAI
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
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-30T07:44:07+00:00",
      "cve": "CVE-2026-64552",
      "id": "CVE-2026-64552",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_not_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virtio-net: fix len check in receive_big()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64552.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T17:09:07Z",
      "cve": "CVE-2026-64552",
      "id": "CVE-2026-64552",
      "initial_release_date": "2026-07-28T17:07:53Z",
      "product_status:first_fixed": "65",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "281",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64552",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64552.json",
      "version": "9"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.