{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46320",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46320"
  ],
  "published": "2026-06-09T12:10:32Z",
  "summary": "tap: free page on error paths in tap_get_user_xdp()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntap: free page on error paths in tap_get_user_xdp()\n\ntap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,\nand returns -ENOMEM when build_skb() fails. Both paths jump to the err\nlabel without freeing the page that vhost_net_build_xdp() allocated for\nthe frame. tap_sendmsg() discards the per-buffer return value and always\nreturns 0, so vhost_tx_batch() takes the success path and never frees\nthe page; each rejected frame in a batch leaks one page-frag chunk.\n\nFree the page on both error paths, before the skb is built. This is the\ntap counterpart of the same leak in tun_xdp_one().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286"
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      "url": "https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2"
    },
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    },
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      "url": "https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388"
    },
    {
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      "url": "https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d"
    },
    {
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      "url": "https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bug is reached when guest-originated TX data crosses the virtio/vhost-net/macvtap boundary into the host tap driver; this is the same adjacent virtual-network path as CVE-2024-41090, not a remote Internet packet to the host stack.\nAC:L - An attacker controls the virtio TX virtqueue and can reliably submit frames shorter than ETH_HLEN or force build_skb failures; each batch can leak up to 64 page-frags and be repeated in a tight loop without race conditions.\nPR:N - In the highest-impact cloud-KVM scenario, a malicious VM tenant needs no host credentials or capabilities\u2014only the ability to send packets from inside an already-provisioned guest using virtio-net.\nUI:N - Exploitation requires no action from the host administrator or any other user beyond normal VM operation; the guest attacker drives the virtqueue directly.\nS:C - The leak occurs in the host kernel while processing guest-supplied descriptors, crossing the VM/host security boundary and degrading host-wide availability beyond the guest\u2019s own security scope.\nC:N - This is a missing put_page on error paths causing page-frag retention; there is no out-of-bounds read, use-after-free, or other memory corruption that could disclose kernel data.\nI:N - No memory is corrupted or written beyond the leaked page allocation; the bug cannot be leveraged for arbitrary write, code execution, or integrity compromise.\nA:H - Sustained submission of short or failing frames leaks one page-frag per rejected buffer; at scale this exhausts host memory and can trigger OOM kills or host panic, matching the identical tun-side fix analysis."
    }
  }
}