Vulnerability-Lookup

FKIE_CVE-2026-53131

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-07-06 15:24

Severity

9.4 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: require Ethernet MAC header before using eth_hdr() `ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and `hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)` after either assuming that the skb is associated with an Ethernet device or checking only that the `ETH_HLEN` bytes at `skb_mac_header(skb)` lie between `skb->head` and `skb->data`. Make these paths first verify that the skb is associated with an Ethernet device, that the MAC header was set, and that it spans at least a full Ethernet header before accessing `eth_hdr(skb)`.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/063f43361e884acd7300790e90194430275d0d0c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4435888e1bf139d2bfe5911643d4217382136743	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/726abf97566867f808fec9d8a408eb9698bd570a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cea435ea7e868ea6fdf039bc4f2090c1d829b556	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	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/ip6t_eui64.c",
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            "net/netfilter/ipset/ip_set_hash_ipmac.c",
            "net/netfilter/ipset/ip_set_hash_mac.c",
            "net/netfilter/nf_log_syslog.c",
            "net/netfilter/xt_mac.c"
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          ],
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          "vendor": "Linux",
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            },
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        }
      ],
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: require Ethernet MAC header before using eth_hdr()\n\n`ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and\n`hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)`\nafter either assuming that the skb is associated with an Ethernet\ndevice or checking only that the `ETH_HLEN` bytes at\n`skb_mac_header(skb)` lie between `skb-\u003ehead` and `skb-\u003edata`.\n\nMake these paths first verify that the skb is associated with an\nEthernet device, that the MAC header was set, and that it spans at\nleast a full Ethernet header before accessing `eth_hdr(skb)`."
    }
  ],
  "id": "CVE-2026-53131",
  "lastModified": "2026-07-06T15:24:25.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
          "version": "3.1"
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        "impactScore": 5.5,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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  "published": "2026-06-25T09:16:30.307",
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          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-53131 (GCVE-0-2026-53131)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-08-05 12:33

Title

netfilter: require Ethernet MAC header before using eth_hdr()

Summary

Severity

9.4 (Critical)


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

Assigner

Linux mitre root Scorecard

References

7 references

URL	Tags
https://git.kernel.org/stable/c/4435888e1bf139d2b…
https://git.kernel.org/stable/c/063f43361e884acd7…
https://git.kernel.org/stable/c/726abf97566867f80…
https://git.kernel.org/stable/c/367abcacc13a8e2e7…
https://git.kernel.org/stable/c/5d634afb8b83b49de…
https://git.kernel.org/stable/c/cea435ea7e868ea6f…
https://git.kernel.org/stable/c/62443dc21114c0bbc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4435888e1bf139d2bfe5911643d4217382136743 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 063f43361e884acd7300790e90194430275d0d0c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 726abf97566867f808fec9d8a408eb9698bd570a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 367abcacc13a8e2e7624408b7f593bd1e60e49d9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d634afb8b83b49de562792fd0d047416a43bd4d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cea435ea7e868ea6fdf039bc4f2090c1d829b556 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 62443dc21114c0bbc476fa62973db89743f2f137 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/ip6t_eui64.c",
            "net/netfilter/ipset/ip_set_bitmap_ipmac.c",
            "net/netfilter/ipset/ip_set_hash_ipmac.c",
            "net/netfilter/ipset/ip_set_hash_mac.c",
            "net/netfilter/nf_log_syslog.c",
            "net/netfilter/xt_mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            "net/netfilter/ipset/ip_set_hash_mac.c",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: require Ethernet MAC header before using eth_hdr()\n\n`ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and\n`hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)`\nafter either assuming that the skb is associated with an Ethernet\ndevice or checking only that the `ETH_HLEN` bytes at\n`skb_mac_header(skb)` lie between `skb-\u003ehead` and `skb-\u003edata`.\n\nMake these paths first verify that the skb is associated with an\nEthernet device, that the MAC header was set, and that it spans at\nleast a full Ethernet header before accessing `eth_hdr(skb)`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.4,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable netfilter match, ipset, and logging paths run while processing packets in receive/netdev hooks. In a reasonable firewall, router, VPN, or tunnel deployment with these rules installed, unauthenticated remote packets can reach the vulnerable code.\nAC:L - No race or difficult timing is required; a packet reaching a vulnerable rule with an invalid, unset, non-Ethernet, or too-short MAC header deterministically drives the bad eth_hdr(skb) access. The needed rule/interface setup is a plausible deployment condition, not an exploit race.\nPR:N - The remote packet sender does not need credentials or local privileges once the affected rule or logger is configured. Although rule installation requires CAP_NET_ADMIN, that is not required for the runtime remote-trigger scenario.\nUI:N - Exploitation is triggered by packet processing and does not require a victim user to open a file, mount anything, or perform another action.\nS:U - The impact remains within the kernel/network stack security authority. There is no VM, IOMMU, or separate sandbox boundary crossing.\nC:H - The flaw causes invalid or out-of-bounds reads from the skb MAC header, and those bytes can be copied into logs/ipset state or influence observable match behavior. Per the required guidance, out-of-bounds reads are scored High when not proven strictly harmless.\nI:L - The primitive is a read rather than an arbitrary write or control-flow hijack. However, the wrongly read MAC bytes can influence firewall matches and ipset add/delete/test behavior, giving limited integrity impact.\nA:H - Invalid eth_hdr(skb) access can produce slab out-of-bounds/KASAN reports or kernel oops/panic conditions, and packets can be sent repeatedly. Kernel crashes are High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:25.251Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4435888e1bf139d2bfe5911643d4217382136743"
        },
        {
          "url": "https://git.kernel.org/stable/c/063f43361e884acd7300790e90194430275d0d0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/726abf97566867f808fec9d8a408eb9698bd570a"
        },
        {
          "url": "https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cea435ea7e868ea6fdf039bc4f2090c1d829b556"
        },
        {
          "url": "https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137"
        }
      ],
      "title": "netfilter: require Ethernet MAC header before using eth_hdr()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53131",
    "datePublished": "2026-06-25T08:38:20.489Z",
    "dateReserved": "2026-06-09T07:44:35.386Z",
    "dateUpdated": "2026-08-05T12:33:25.251Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.

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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FKIE_CVE-2026-53131

CVE-2026-53131 (GCVE-0-2026-53131)

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