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CVE-2026-46322

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: tun: free page on build_skb failure in tun_xdp_one() When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk. Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.

Severity
HIGH
CVSS score
7.1 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-09 13:16:37.603000
Last modified
2026-10-19 20:18:43
View original CVE JSON 
{
  "id": "CVE-2026-46322",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-06-09T13:16:37.603",
  "lastModified": "2026-10-19T20:18:43.000",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on build_skb failure in tun_xdp_one()\n\nWhen build_skb() fails in tun_xdp_one(), the function sets ret to\n-ENOMEM and jumps to the out label, which returns without freeing the\npage that vhost_net_build_xdp() allocated for the frame. As with the\nshort-frame rejection path, tun_sendmsg() discards the per-buffer error\nand still returns total_len, so vhost_tx_batch() takes the success path\nand never frees the page. Each build_skb() failure in a batch leaks one\npage-frag chunk.\n\nFree the page before taking the error path, matching the put_page() the\nother error exits of tun_xdp_one() already perform."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntun: liberar página en caso de fallo de build_skb() en tun_xdp_one()\n\nCuando build_skb() falla en tun_xdp_one(), la función establece ret en -ENOMEM y salta a la etiqueta out, la cual retorna sin liberar la página que vhost_net_build_xdp() asignó para el frame. Al igual que con la ruta de rechazo de frames cortos, tun_sendmsg() descarta el error por búfer y aún retorna total_len, por lo que vhost_tx_batch() toma la ruta de éxito y nunca libera la página. Cada fallo de build_skb() en un lote fuga un fragmento de página.\n\nLiberar la página antes de tomar la ruta de error, coincidiendo con el put_page() que las otras salidas de error de tun_xdp_one() ya realizan."
    }
  ],
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              "versionType": "original_commit_for_fix",
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    },
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      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
          "defaultStatus": "unknown",
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              "version": "0",
              "lessThan": "*",
              "versionType": "custom",
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  "metrics": {
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          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
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      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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          "role": "CISA Coordinator",
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  "configurations": [
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