Vulnerability-Lookup

GHSA-C7CV-93JX-FC79

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-05-28 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: fix empty payload in tap skb for non-linear buffers

For non-linear skbs, virtio_transport_build_skb() goes through virtio_transport_copy_nonlinear_skb() to copy the original payload in the new skb to be delivered to the vsockmon tap device. This manually initializes an iov_iter but does not set iov_iter.count. Since the iov_iter is zero-initialized, the copy length is zero and no payload is actually copied to the monitor interface, leaving data un-initialized.

Fix this by removing the linear vs non-linear split and using skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as vhost-vsock already does. This handles both linear and non-linear skbs, properly initializes the iov_iter, and removes the now unused virtio_transport_copy_nonlinear_skb().

While touching this code, let's also check the return value of skb_copy_datagram_iter(), even though it's unlikely to fail.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46207"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix empty payload in tap skb for non-linear buffers\n\nFor non-linear skbs, virtio_transport_build_skb() goes through\nvirtio_transport_copy_nonlinear_skb() to copy the original payload\nin the new skb to be delivered to the vsockmon tap device.\nThis manually initializes an iov_iter but does not set iov_iter.count.\nSince the iov_iter is zero-initialized, the copy length is zero and no\npayload is actually copied to the monitor interface, leaving data\nun-initialized.\n\nFix this by removing the linear vs non-linear split and using\nskb_copy_datagram_iter() with iov_iter_kvec() for all cases, as\nvhost-vsock already does. This handles both linear and non-linear skbs,\nproperly initializes the iov_iter, and removes the now unused\nvirtio_transport_copy_nonlinear_skb().\n\nWhile touching this code, let\u0027s also check the return value of\nskb_copy_datagram_iter(), even though it\u0027s unlikely to fail.",
  "id": "GHSA-c7cv-93jx-fc79",
  "modified": "2026-05-28T12:30:32Z",
  "published": "2026-05-28T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46207 (GCVE-0-2026-46207)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:40 – Updated: 2026-05-28 09:40

Title

vsock/virtio: fix empty payload in tap skb for non-linear buffers

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix empty payload in tap skb for non-linear buffers For non-linear skbs, virtio_transport_build_skb() goes through virtio_transport_copy_nonlinear_skb() to copy the original payload in the new skb to be delivered to the vsockmon tap device. This manually initializes an iov_iter but does not set iov_iter.count. Since the iov_iter is zero-initialized, the copy length is zero and no payload is actually copied to the monitor interface, leaving data un-initialized. Fix this by removing the linear vs non-linear split and using skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as vhost-vsock already does. This handles both linear and non-linear skbs, properly initializes the iov_iter, and removes the now unused virtio_transport_copy_nonlinear_skb(). While touching this code, let's also check the return value of skb_copy_datagram_iter(), even though it's unlikely to fail.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/06747f52ab157591c…
https://git.kernel.org/stable/c/52da6a74ca3de0fcd…
https://git.kernel.org/stable/c/378b131a25bd1a5ee…
https://git.kernel.org/stable/c/3a3e3d90cbc796005…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4b0bf10eb077cb43c09746251ef3608d62c45667 , < 06747f52ab157591cec7e5623a759473b66ef6f6 (git) Affected: 4b0bf10eb077cb43c09746251ef3608d62c45667 , < 52da6a74ca3de0fcda60301096b71534b3b18641 (git) Affected: 4b0bf10eb077cb43c09746251ef3608d62c45667 , < 378b131a25bd1a5ee27ca199fe486c299d5350c5 (git) Affected: 4b0bf10eb077cb43c09746251ef3608d62c45667 , < 3a3e3d90cbc79600544536723911657730759af3 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.90 , ≤ 6.12.* (semver) Unaffected: 6.18.32 , ≤ 6.18.* (semver) Unaffected: 7.0.9 , ≤ 7.0.* (semver) Unaffected: 7.1-rc4 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "06747f52ab157591cec7e5623a759473b66ef6f6",
              "status": "affected",
              "version": "4b0bf10eb077cb43c09746251ef3608d62c45667",
              "versionType": "git"
            },
            {
              "lessThan": "52da6a74ca3de0fcda60301096b71534b3b18641",
              "status": "affected",
              "version": "4b0bf10eb077cb43c09746251ef3608d62c45667",
              "versionType": "git"
            },
            {
              "lessThan": "378b131a25bd1a5ee27ca199fe486c299d5350c5",
              "status": "affected",
              "version": "4b0bf10eb077cb43c09746251ef3608d62c45667",
              "versionType": "git"
            },
            {
              "lessThan": "3a3e3d90cbc79600544536723911657730759af3",
              "status": "affected",
              "version": "4b0bf10eb077cb43c09746251ef3608d62c45667",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.90",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.32",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.90",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.32",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix empty payload in tap skb for non-linear buffers\n\nFor non-linear skbs, virtio_transport_build_skb() goes through\nvirtio_transport_copy_nonlinear_skb() to copy the original payload\nin the new skb to be delivered to the vsockmon tap device.\nThis manually initializes an iov_iter but does not set iov_iter.count.\nSince the iov_iter is zero-initialized, the copy length is zero and no\npayload is actually copied to the monitor interface, leaving data\nun-initialized.\n\nFix this by removing the linear vs non-linear split and using\nskb_copy_datagram_iter() with iov_iter_kvec() for all cases, as\nvhost-vsock already does. This handles both linear and non-linear skbs,\nproperly initializes the iov_iter, and removes the now unused\nvirtio_transport_copy_nonlinear_skb().\n\nWhile touching this code, let\u0027s also check the return value of\nskb_copy_datagram_iter(), even though it\u0027s unlikely to fail."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-28T09:40:25.583Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641"
        },
        {
          "url": "https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3"
        }
      ],
      "title": "vsock/virtio: fix empty payload in tap skb for non-linear buffers",
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        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46207",
    "datePublished": "2026-05-28T09:40:25.583Z",
    "dateReserved": "2026-05-13T15:03:33.105Z",
    "dateUpdated": "2026-05-28T09:40:25.583Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-C7CV-93JX-FC79

CVE-2026-46207 (GCVE-0-2026-46207)

Tags

Sightings

Nomenclature