{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46321",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46321"
  ],
  "published": "2026-06-09T12:10:32Z",
  "summary": "tun: free page on short-frame rejection in tun_xdp_one()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_xdp() allocated for it.\ntun_sendmsg() discards that -EINVAL and still returns total_len, so\nvhost_tx_batch() takes the success path and never frees the page; each\nshort frame in a batch leaks one page-frag chunk.\n\nA local process that can open /dev/net/tun and /dev/vhost-net can hit\nthis path: it attaches a tun/tap device as the vhost-net backend and\nfeeds TX descriptors whose length minus the virtio-net header is below\nETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a\ntight submission loop exhausts host memory and triggers an OOM panic.\nFree the page before returning -EINVAL, matching the XDP-program error\npath in the same function.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/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-2026-46321"
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      "url": "https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is reached via local host interfaces (/dev/net/tun and /dev/vhost-net ioctls/sendmsg) or from a KVM guest through virtio-net TX descriptors processed by vhost-net, not via remote network packets to the host stack.\nAC:L - An attacker reliably triggers the leak by repeatedly submitting TX frames whose length minus the virtio-net header is below ETH_HLEN; no races or attacker-uncontrollable layout conditions are required.\nPR:N - A malicious KVM guest on a host using vhost-net with a tun/tap backend needs no host privileges\u2014only the ability to craft short virtio-net TX descriptors\u2014while a direct host attacker can also obtain CAP_NET_ADMIN via unprivileged user namespaces.\nUI:N - Exploitation requires no victim interaction beyond normal VM or namespace operation; the attacker drives the vhost TX path directly in a tight loop.\nS:C - In the highest-impact cloud/KVM deployment, an unprivileged guest VM crosses the hypervisor security boundary to exhaust host kernel memory and panic the host, affecting resources outside the guest's security scope.\nC:N - The bug is a page-fragment memory leak with no out-of-bounds access, use-after-free, or information disclosure; freed pages are simply never returned to the allocator.\nI:N - No kernel memory corruption or data modification occurs; the only effect is unbounded consumption of page-frags leading to denial of service.\nA:H - Sustained submission of short batched frames leaks one page-frag per frame, exhausts host memory, and can trigger an OOM kernel panic as described in the fix commit."
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}