FKIE_CVE-2025-40292

Vulnerability from fkie_nvd - Published: 2025-12-08 01:16 - Updated: 2026-10-15 22:19
Severity
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix received length check in big packets Since commit 4959aebba8c0 ("virtio-net: use mtu size as buffer length for big packets"), when guest gso is off, the allocated size for big packets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on negotiated MTU. The number of allocated frags for big packets is stored in vi->big_packets_num_skbfrags. Because the host announced buffer length can be malicious (e.g. the host vhost_net driver's get_rx_bufs is modified to announce incorrect length), we need a check in virtio_net receive path. Currently, the check is not adapted to the new change which can lead to NULL page pointer dereference in the below while loop when receiving length that is larger than the allocated one. This commit fixes the received length check corresponding to the new change.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82f9028e83944a9eee5229cbc6fee9be1de8a62d",
              "status": "affected",
              "version": "4959aebba8c06992abafa09d1e80965e0825af54",
              "versionType": "git"
            },
            {
              "lessThan": "946dec89c41726b94d31147ec528b96af0be1b5a",
              "status": "affected",
              "version": "4959aebba8c06992abafa09d1e80965e0825af54",
              "versionType": "git"
            },
            {
              "lessThan": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b",
              "status": "affected",
              "version": "4959aebba8c06992abafa09d1e80965e0825af54",
              "versionType": "git"
            },
            {
              "lessThan": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2",
              "status": "affected",
              "version": "4959aebba8c06992abafa09d1e80965e0825af54",
              "versionType": "git"
            },
            {
              "lessThan": "0c716703965ffc5ef4311b65cb5d84a703784717",
              "status": "affected",
              "version": "4959aebba8c06992abafa09d1e80965e0825af54",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: fix received length check in big packets\n\nSince commit 4959aebba8c0 (\"virtio-net: use mtu size as buffer length\nfor big packets\"), when guest gso is off, the allocated size for big\npackets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on\nnegotiated MTU. The number of allocated frags for big packets is stored\nin vi-\u003ebig_packets_num_skbfrags.\n\nBecause the host announced buffer length can be malicious (e.g. the host\nvhost_net driver\u0027s get_rx_bufs is modified to announce incorrect\nlength), we need a check in virtio_net receive path. Currently, the\ncheck is not adapted to the new change which can lead to NULL page\npointer dereference in the below while loop when receiving length that\nis larger than the allocated one.\n\nThis commit fixes the received length check corresponding to the new\nchange."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvirtio-net: corrige la comprobaci\u00f3n de longitud recibida en paquetes grandes\n\nDesde el commit 4959aebba8c0 (\u0027virtio-net: usar el tama\u00f1o de mtu como longitud de b\u00fafer para paquetes grandes\u0027), cuando el gso del invitado est\u00e1 desactivado, el tama\u00f1o asignado para paquetes grandes ya no es MAX_SKB_FRAGS * PAGE_SIZE, sino que depende de la MTU negociada. El n\u00famero de fragmentos asignados para paquetes grandes se almacena en vi -\u003e big_packets_num_skbfrags.\n\nDebido a que la longitud del b\u00fafer anunciada por el host puede ser maliciosa (por ejemplo, el get_rx_bufs del controlador vhost_net del host se modifica para anunciar una longitud incorrecta), necesitamos una comprobaci\u00f3n en la ruta de recepci\u00f3n de virtio_net. Actualmente, la comprobaci\u00f3n no est\u00e1 adaptada al nuevo cambio, lo que puede llevar a una desreferencia de puntero de p\u00e1gina NULL en el bucle \u0027while\u0027 inferior al recibir una longitud mayor que la asignada.\n\nEste commit corrige la comprobaci\u00f3n de longitud recibida correspondiente al nuevo cambio."
    }
  ],
  "id": "CVE-2025-40292",
  "lastModified": "2026-10-15T22:19:07.123",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40292",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T21:58:49.590462Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-12-08T01:16:01.160",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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