Vulnerability-Lookup

GHSA-C44P-Q7R3-5852

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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

vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement.

Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count.

This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52994"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\n\nvirtio_transport_init_zcopy_skb() uses iter-\u003ecount as the size argument\nfor msg_zerocopy_realloc(), which in turn passes it to\nmm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this\nfunction is called after virtio_transport_fill_skb() has already consumed\nthe iterator via __zerocopy_sg_from_iter(), so on the last skb, iter-\u003ecount\nwill be 0, skipping the RLIMIT_MEMLOCK enforcement.\n\nPass pkt_len (the total bytes being sent) as an explicit parameter to\nvirtio_transport_init_zcopy_skb() instead of reading the already-consumed\niter-\u003ecount.\n\nThis matches TCP and UDP, which both call msg_zerocopy_realloc() with\nthe original message size.",
  "id": "GHSA-c44p-q7r3-5852",
  "modified": "2026-06-24T18:32:43Z",
  "published": "2026-06-24T18:32:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52994"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-52994 (GCVE-0-2026-52994)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement. Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count. This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6af1736b5810bc8a4…
https://git.kernel.org/stable/c/d0117950075f0a9d5…
https://git.kernel.org/stable/c/1cb36e252211506f5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < 6af1736b5810bc8a4a43a8518530113f5a757dc1 (git) Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < d0117950075f0a9d5944980784c719d8ebcd4bff (git) Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < 1cb36e252211506f51095fe7ced8286cc77b4c80 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (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": "6af1736b5810bc8a4a43a8518530113f5a757dc1",
              "status": "affected",
              "version": "581512a6dc939ef122e49336626ae159f3b8a345",
              "versionType": "git"
            },
            {
              "lessThan": "d0117950075f0a9d5944980784c719d8ebcd4bff",
              "status": "affected",
              "version": "581512a6dc939ef122e49336626ae159f3b8a345",
              "versionType": "git"
            },
            {
              "lessThan": "1cb36e252211506f51095fe7ced8286cc77b4c80",
              "status": "affected",
              "version": "581512a6dc939ef122e49336626ae159f3b8a345",
              "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": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting\n\nvirtio_transport_init_zcopy_skb() uses iter-\u003ecount as the size argument\nfor msg_zerocopy_realloc(), which in turn passes it to\nmm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this\nfunction is called after virtio_transport_fill_skb() has already consumed\nthe iterator via __zerocopy_sg_from_iter(), so on the last skb, iter-\u003ecount\nwill be 0, skipping the RLIMIT_MEMLOCK enforcement.\n\nPass pkt_len (the total bytes being sent) as an explicit parameter to\nvirtio_transport_init_zcopy_skb() instead of reading the already-consumed\niter-\u003ecount.\n\nThis matches TCP and UDP, which both call msg_zerocopy_realloc() with\nthe original message size."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:07.360Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80"
        }
      ],
      "title": "vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52994",
    "datePublished": "2026-06-24T16:29:07.360Z",
    "dateReserved": "2026-06-09T07:44:35.377Z",
    "dateUpdated": "2026-06-24T16:29:07.360Z",
    "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-C44P-Q7R3-5852

CVE-2026-52994 (GCVE-0-2026-52994)

Tags

Sightings

Nomenclature