FKIE_CVE-2026-74701

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Ethernet header length in key_extract() When a packet arrives on an ARPHRD_NONE device (e.g. TUN), ovs_flow_key_extract() trusts the user-provided skb->protocol field: if it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in __skb_pull() when the linear area is too small. kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovs_flow_key_extract+0x419/0xa70 ovs_vport_receive+0x222/0x390 netdev_frame_hook+0x3e0/0x630 tun_get_user+0x2d0c/0x38e0 Fixed by calling check_header() in key_extract() before accessing the Ethernet header.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/flow.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e85278afd4890dd190ba3c7a1b1a712b801c9fe1",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "81f9b09f0ea3ba9ab966dd17e9f32625a14555e9",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "831471718f6e19aed1a330b03b53190a90e06466",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "d8bea341b183190ce6c055ab0e64ab78eb9a7290",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "0b60b55652ba772b173dddc63f3851e1d2dd5927",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "a8139285c8925efe59af28a9169bb2fda91bff15",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "9b8cfbb58b85bfa7a78fac47fdc77396cd01f699",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            },
            {
              "lessThan": "cf6f8b29befb92173659bcef6a441d274947bfae",
              "status": "affected",
              "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/flow.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nnet/openvswitch: check Ethernet header length in key_extract()\n\nWhen a packet arrives on an ARPHRD_NONE device (e.g. TUN),\novs_flow_key_extract() trusts the user-provided skb-\u003eprotocol field: if\nit is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and\nkey_extract() is called without ensuring the skb has ETH_HLEN (14) bytes\nof linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes\nfor MAC addresses and parse_ethertype() pulls 2 more, either of which\ntriggers a kernel BUG in __skb_pull() when the linear area is too small.\n\n  kernel BUG at include/linux/skbuff.h:2848!\n  RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933\n  ovs_flow_key_extract+0x419/0xa70\n  ovs_vport_receive+0x222/0x390\n  netdev_frame_hook+0x3e0/0x630\n  tun_get_user+0x2d0c/0x38e0\n\nFixed by calling check_header() in key_extract() before accessing the\nEthernet header."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/openvswitch: verificar la longitud de la cabecera Ethernet en key_extract()\n\nCuando un paquete llega a un dispositivo ARPHRD_NONE (p. ej. TUN), ovs_flow_key_extract() conf\u00eda en el campo skb -\u003e protocol proporcionado por el usuario: si es ETH_P_TEB, el paquete se clasifica como MAC_PROTO_ETHERNET y se llama a key_extract() sin asegurar que el skb tenga ETH_HLEN (14) bytes de datos lineales. key_extract() extrae incondicionalmente 2 * ETH_ALEN bytes para direcciones MAC y parse_ethertype() extrae 2 m\u00e1s, cualquiera de los cuales activa un BUG del kernel en __skb_pull() cuando el \u00e1rea lineal es demasiado peque\u00f1a.\n\nBUG del kernel en include/linux/skbuff.h:2848!\nRIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933\novs_flow_key_extract+0x419/0xa70\novs_vport_receive+0x222/0x390\nnetdev_frame_hook+0x3e0/0x630\ntun_get_user+0x2d0c/0x38e0\n\nSolucionado llamando a check_header() en key_extract() antes de acceder a la cabecera Ethernet."
    }
  ],
  "id": "CVE-2026-74701",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:44.740",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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