FKIE_CVE-2026-46321

Vulnerability from fkie_nvd - Published: 2026-06-09 13:16 - Updated: 2026-06-09 13:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-46321",
  "lastModified": "2026-06-09T13:16:37.473",
  "metrics": {},
  "published": "2026-06-09T13:16:37.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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