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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < 6af1736b5810bc8a4a43a8518530113f5a757dc1 (git)
Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < d0117950075f0a9d5944980784c719d8ebcd4bff (git)
Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < 1cb36e252211506f51095fe7ced8286cc77b4c80 (git)
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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": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
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              "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 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"
      },
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          "url": "https://git.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1"
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          "url": "https://git.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80"
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      ],
      "title": "vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting",
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    "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",
  "vulnerability-lookup:meta": {
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  }
}


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