CVE-2026-46321 (GCVE-0-2026-46321)
Vulnerability from cvelistv5
Published
2026-06-09 12:11
Modified
2026-06-09 12:11
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
Impacted products
Vendor Product Version
Linux Linux Version: 049584807f1d797fc3078b68035450a9769eb5c3
Version: 049584807f1d797fc3078b68035450a9769eb5c3
Version: 049584807f1d797fc3078b68035450a9769eb5c3
Version: 049584807f1d797fc3078b68035450a9769eb5c3
Version: 32b0aaba5dbc85816898167d9b5d45a22eae82e9
Version: 6100e0237204890269e3f934acfc50d35fd6f319
Version: 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2
Version: ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146
Version: d5ad89b7d01ed4e66fd04734fc63d6e78536692a
Version: a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb
Version: 8418f55302fa1d2eeb73e16e345167e545c598a5
Version: 5.4.281   ≤
Version: 5.10.223   ≤
Version: 5.15.164   ≤
Version: 6.1.102   ≤
Version: 6.6.43   ≤
Version: 6.9.12   ≤
Version: 6.10.2   ≤
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T12:11:13.872Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"
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          "url": "https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"
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          "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46321",
    "datePublished": "2026-06-09T12:11:13.872Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-06-09T12:11:13.872Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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