Vulnerability-Lookup

FKIE_CVE-2021-47309

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net: validate lwtstate->data before returning from skb_tunnel_info() skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info type without validation. lwtstate->data can have various types such as mpls_iptunnel_encap, etc and these are not compatible. So skb_tunnel_info() should validate before returning that pointer. Splat looks like: BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan] Read of size 2 at addr ffff888106ec2698 by task ping/811 CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195 Call Trace: dump_stack_lvl+0x56/0x7b print_address_description.constprop.8.cold.13+0x13/0x2ee ? vxlan_get_route+0x418/0x4b0 [vxlan] ? vxlan_get_route+0x418/0x4b0 [vxlan] kasan_report.cold.14+0x83/0xdf ? vxlan_get_route+0x418/0x4b0 [vxlan] vxlan_get_route+0x418/0x4b0 [vxlan] [ ... ] vxlan_xmit_one+0x148b/0x32b0 [vxlan] [ ... ] vxlan_xmit+0x25c5/0x4780 [vxlan] [ ... ] dev_hard_start_xmit+0x1ae/0x6e0 __dev_queue_xmit+0x1f39/0x31a0 [ ... ] neigh_xmit+0x2f9/0x940 mpls_xmit+0x911/0x1600 [mpls_iptunnel] lwtunnel_xmit+0x18f/0x450 ip_finish_output2+0x867/0x2040 [ ... ]

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.14

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_metadata.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "e7f3c9df40515a6c6b46f36c4c94cf48a043f887",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "b61d327cd3cc5ea591f3bf751dd11e034f388bb5",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "8aa13a86964cdec4fd969ef677c6614ff068641a",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "2179d96ec702cc33ead02a9ce40ece599b8538c5",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "a915379594f1e045421635c6316d8f3ffa018c58",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "67a9c94317402b826fc3db32afc8f39336803d97",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_metadata.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.277",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.277",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5A6521A3-1CD2-4EFB-B365-323A55C98EE5",
              "versionEndExcluding": "4.4.277",
              "versionStartIncluding": "4.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B543C082-5612-489A-A957-B7F2B8822025",
              "versionEndExcluding": "4.9.277",
              "versionStartIncluding": "4.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6A796929-CDBE-45AF-BD44-F357F64AFFCA",
              "versionEndExcluding": "4.14.241",
              "versionStartIncluding": "4.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D1C5B0E1-06E7-4615-AA17-02585202D86E",
              "versionEndExcluding": "4.19.199",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3EF7BA79-262D-4A55-A0A1-E0D0BCA7C320",
              "versionEndExcluding": "5.4.135",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "08E2D438-D50E-43C5-AF10-D62FE49B5815",
              "versionEndExcluding": "5.10.53",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "808DF8D9-4913-4CC7-B91F-B4146556B7ED",
              "versionEndExcluding": "5.13.5",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "71268287-21A8-4488-AA4F-23C473153131",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: validate lwtstate-\u003edata before returning from skb_tunnel_info()\n\nskb_tunnel_info() returns pointer of lwtstate-\u003edata as ip_tunnel_info\ntype without validation. lwtstate-\u003edata can have various types such as\nmpls_iptunnel_encap, etc and these are not compatible.\nSo skb_tunnel_info() should validate before returning that pointer.\n\nSplat looks like:\nBUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]\nRead of size 2 at addr ffff888106ec2698 by task ping/811\n\nCPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195\nCall Trace:\n dump_stack_lvl+0x56/0x7b\n print_address_description.constprop.8.cold.13+0x13/0x2ee\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n kasan_report.cold.14+0x83/0xdf\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n vxlan_get_route+0x418/0x4b0 [vxlan]\n [ ... ]\n vxlan_xmit_one+0x148b/0x32b0 [vxlan]\n [ ... ]\n vxlan_xmit+0x25c5/0x4780 [vxlan]\n [ ... ]\n dev_hard_start_xmit+0x1ae/0x6e0\n __dev_queue_xmit+0x1f39/0x31a0\n [ ... ]\n neigh_xmit+0x2f9/0x940\n mpls_xmit+0x911/0x1600 [mpls_iptunnel]\n lwtunnel_xmit+0x18f/0x450\n ip_finish_output2+0x867/0x2040\n [ ... ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: validar lwtstate-\u0026gt;data antes de regresar de skb_tunnel_info() skb_tunnel_info() devuelve un puntero de lwtstate-\u0026gt;data como tipo ip_tunnel_info sin validaci\u00f3n. lwtstate-\u0026gt;data puede tener varios tipos como mpls_iptunnel_encap, etc. y estos no son compatibles. Entonces skb_tunnel_info() deber\u00eda validarse antes de devolver ese puntero. Splat se ve as\u00ed: BUG: KASAN: slab fuera de los l\u00edmites en vxlan_get_route+0x418/0x4b0 [vxlan] Lectura de tama\u00f1o 2 en la direcci\u00f3n ffff888106ec2698 mediante tarea ping/811 CPU: 1 PID: 811 Comm: ping No contaminado 5.13.0 + #1195 Seguimiento de llamadas: dump_stack_lvl+0x56/0x7b print_address_description.constprop.8.cold.13+0x13/0x2ee? vxlan_get_route+0x418/0x4b0 [vxlan] ? vxlan_get_route+0x418/0x4b0 [vxlan] kasan_report.cold.14+0x83/0xdf? vxlan_get_route+0x418/0x4b0 [vxlan] vxlan_get_route+0x418/0x4b0 [vxlan] [ ... ] vxlan_xmit_one+0x148b/0x32b0 [vxlan] [ ... ] vxlan_xmit+0x25c5/0x4780 [vxlan] [ ... ] +0x1ae /0x6e0 __dev_queue_xmit+0x1f39/0x31a0 [...] veck_xMit+0x2f9/0x940 mpls_xmit+0x911/0x1600 [mpls_iptunnel] lwtunnel_xmit+0x18f/0x450 ip_finish_output2+0x20467/0x2040"
    }
  ],
  "id": "CVE-2021-47309",
  "lastModified": "2026-08-04T10:16:57.623",
  "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"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47309",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-23T19:12:00.559990Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:18.453",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97"
    },
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
      "url": "https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-47309 (GCVE-0-2021-47309)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47

Title

net: validate lwtstate->data before returning from skb_tunnel_info()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-23 19:12 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/e7f3c9df40515a6c6…
https://git.kernel.org/stable/c/b61d327cd3cc5ea59…
https://git.kernel.org/stable/c/83bdcfbd968bcc91a…
https://git.kernel.org/stable/c/8bb1589c89e61e3b1…
https://git.kernel.org/stable/c/8aa13a86964cdec4f…
https://git.kernel.org/stable/c/2179d96ec702cc33e…
https://git.kernel.org/stable/c/a915379594f1e0454…
https://git.kernel.org/stable/c/67a9c94317402b826…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < e7f3c9df40515a6c6b46f36c4c94cf48a043f887 (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < b61d327cd3cc5ea591f3bf751dd11e034f388bb5 (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 8bb1589c89e61e3b182dd546f1021928ebb5c2a6 (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 8aa13a86964cdec4fd969ef677c6614ff068641a (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 2179d96ec702cc33ead02a9ce40ece599b8538c5 (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < a915379594f1e045421635c6316d8f3ffa018c58 (git) Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 67a9c94317402b826fc3db32afc8f39336803d97 (git)
Linux	Linux	Affected: 4.3 Unaffected: 0 , < 4.3 (semver) Unaffected: 4.4.277 , ≤ 4.4.* (semver) Unaffected: 4.9.277 , ≤ 4.9.* (semver) Unaffected: 4.14.241 , ≤ 4.14.* (semver) Unaffected: 4.19.199 , ≤ 4.19.* (semver) Unaffected: 5.4.135 , ≤ 5.4.* (semver) Unaffected: 5.10.53 , ≤ 5.10.* (semver) Unaffected: 5.13.5 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47309",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-23T19:12:00.559990Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:14:34.709Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.596Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
          },
          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5"
          },
          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d"
          },
          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6"
          },
          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a"
          },
          {
            "tags": [
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            "url": "https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5"
          },
          {
            "tags": [
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            "url": "https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58"
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          {
            "tags": [
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            "url": "https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_metadata.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e7f3c9df40515a6c6b46f36c4c94cf48a043f887",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "b61d327cd3cc5ea591f3bf751dd11e034f388bb5",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "8bb1589c89e61e3b182dd546f1021928ebb5c2a6",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "8aa13a86964cdec4fd969ef677c6614ff068641a",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "2179d96ec702cc33ead02a9ce40ece599b8538c5",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "a915379594f1e045421635c6316d8f3ffa018c58",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            },
            {
              "lessThan": "67a9c94317402b826fc3db32afc8f39336803d97",
              "status": "affected",
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_metadata.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.277",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.277",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.4.277",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.277",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.241",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.199",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.135",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.53",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13.5",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: validate lwtstate-\u003edata before returning from skb_tunnel_info()\n\nskb_tunnel_info() returns pointer of lwtstate-\u003edata as ip_tunnel_info\ntype without validation. lwtstate-\u003edata can have various types such as\nmpls_iptunnel_encap, etc and these are not compatible.\nSo skb_tunnel_info() should validate before returning that pointer.\n\nSplat looks like:\nBUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]\nRead of size 2 at addr ffff888106ec2698 by task ping/811\n\nCPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195\nCall Trace:\n dump_stack_lvl+0x56/0x7b\n print_address_description.constprop.8.cold.13+0x13/0x2ee\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n kasan_report.cold.14+0x83/0xdf\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n vxlan_get_route+0x418/0x4b0 [vxlan]\n [ ... ]\n vxlan_xmit_one+0x148b/0x32b0 [vxlan]\n [ ... ]\n vxlan_xmit+0x25c5/0x4780 [vxlan]\n [ ... ]\n dev_hard_start_xmit+0x1ae/0x6e0\n __dev_queue_xmit+0x1f39/0x31a0\n [ ... ]\n neigh_xmit+0x2f9/0x940\n mpls_xmit+0x911/0x1600 [mpls_iptunnel]\n lwtunnel_xmit+0x18f/0x450\n ip_finish_output2+0x867/0x2040\n [ ... ]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires locally configuring a non-IP LWT route (e.g. MPLS encap) whose output device is a tunnel that calls skb_tunnel_info() (VXLAN/GENEVE), then sending traffic on that path via netlink/syscalls\u2014not a remote packet-only entry point.\nAC:L - Once the LWT-over-tunnel topology is set up, the bug triggers reliably on ordinary transmit (as in the reported ping splat); the attacker fully controls configuration and packet generation with no race or luck required.\nPR:L - Creating VXLAN/GENEVE devices and MPLS/other LWT routes needs CAP_NET_ADMIN, which an unprivileged user obtains in a user+net namespace (unshare -Urn); after setup even a normal local send triggers the OOB.\nUI:N - No victim action is required; the attacker configures the netns topology and sends packets themselves.\nS:U - Impact stays within the kernel\u2019s own authority (local memory corruption/DoS/privilege escalation); this is not a VM, IOMMU, or other cross-boundary escape.\nC:H - skb_tunnel_info() type-confuses a small mpls_iptunnel_encap (or similar) as a much larger ip_tunnel_info, producing unbounded slab out-of-bounds reads of adjacent kernel heap that can disclose memory (e.g. via tunnel key fields or BPF get_tunnel_key).\nI:H - This is heap type confusion; on collect-metadata VXLAN/GENEVE paths the bogus info drives \u0026info-\u003edst_cache and related state, enabling out-of-bounds writes into adjacent heap when those fields are attacker-influenced.\nA:H - The documented KASAN slab-out-of-bounds in vxlan_get_route demonstrates a kernel oops/crash path, and invalid heap accesses can panic or hang the machine."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:47:13.551Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
        },
        {
          "url": "https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5"
        },
        {
          "url": "https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58"
        },
        {
          "url": "https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97"
        }
      ],
      "title": "net: validate lwtstate-\u003edata before returning from skb_tunnel_info()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47309",
    "datePublished": "2024-05-21T14:35:27.981Z",
    "dateReserved": "2024-05-21T14:28:16.972Z",
    "dateUpdated": "2026-08-05T08:47:13.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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