{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "581512a6dc939ef122e49336626ae159f3b8a345"
            },
            {
              "fixed": "6af1736b5810bc8a4a43a8518530113f5a757dc1"
            },
            {
              "fixed": "d0117950075f0a9d5944980784c719d8ebcd4bff"
            },
            {
              "fixed": "1cb36e252211506f51095fe7ced8286cc77b4c80"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52994.json"
  },
  "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": "CVE-2026-52994",
  "modified": "2026-07-15T01:49:16.109270705Z",
  "published": "2026-06-24T16:29:07.360Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52994.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52994"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting"
}