Vulnerability-Lookup

GHSA-348F-JXJQ-8XPV

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: ensure minimal ethernet header on TX

As documented in commit 8bd67ebb50c0 ("net: bridge: xmit: make sure we have at least eth header len bytes"), it is possible by for a local user with eBPF TC hook access to attach a tc filter which truncates the packet and redirects to an batadv interface. But the code assumes that at least ETH_HLEN bytes are available and thus might read outside of the available buffer.

The batadv_interface_tx() must therefore always check itself if enough data is available for the ethernet header and don't rely on min_header_len.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72232"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:50Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: ensure minimal ethernet header on TX\n\nAs documented in commit 8bd67ebb50c0 (\"net: bridge: xmit: make sure we have\nat least eth header len bytes\"), it is possible by for a local user with\neBPF TC hook access to attach a tc filter which truncates the packet and\nredirects to an batadv interface. But the code assumes that at least\nETH_HLEN bytes are available and thus might read outside of the available\nbuffer.\n\nThe batadv_interface_tx() must therefore always check itself if enough data\nis available for the ethernet header and don\u0027t rely on min_header_len.",
  "id": "GHSA-348f-jxjq-8xpv",
  "modified": "2026-08-17T06:33:18Z",
  "published": "2026-08-15T06:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72232"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38cd10b0aeec755d89f78722a2b83f4088ff0cb0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58799078afebd5115e052bf69ad6697f9759dd6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b4f521e01257387906f8b969ad3450d8208d4e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/811fea37620f2097955d95ce81cfdba03fd30f1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e16b6751a8206de0b865d99bb02771e6751d12d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbeb4145d9778f922f459935da9a027750765a69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6640923afee619d9fa82b07394dc9498e202304"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72232 (GCVE-0-2026-72232)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:41

Title

batman-adv: ensure minimal ethernet header on TX

Summary

In the Linux kernel, the following vulnerability has been resolved: batman-adv: ensure minimal ethernet header on TX As documented in commit 8bd67ebb50c0 ("net: bridge: xmit: make sure we have at least eth header len bytes"), it is possible by for a local user with eBPF TC hook access to attach a tc filter which truncates the packet and redirects to an batadv interface. But the code assumes that at least ETH_HLEN bytes are available and thus might read outside of the available buffer. The batadv_interface_tx() must therefore always check itself if enough data is available for the ethernet header and don't rely on min_header_len.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/58799078afebd5115…
https://git.kernel.org/stable/c/38cd10b0aeec755d8…
https://git.kernel.org/stable/c/811fea37620f20979…
https://git.kernel.org/stable/c/e6640923afee619d9…
https://git.kernel.org/stable/c/6b4f521e012573879…
https://git.kernel.org/stable/c/9e16b6751a8206de0…
https://git.kernel.org/stable/c/dbeb4145d9778f922…
https://git.kernel.org/stable/c/49df66b7993c80b80…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 58799078afebd5115e052bf69ad6697f9759dd6f (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 38cd10b0aeec755d89f78722a2b83f4088ff0cb0 (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 811fea37620f2097955d95ce81cfdba03fd30f1b (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < e6640923afee619d9fa82b07394dc9498e202304 (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6b4f521e01257387906f8b969ad3450d8208d4e2 (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 9e16b6751a8206de0b865d99bb02771e6751d12d (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < dbeb4145d9778f922f459935da9a027750765a69 (git) Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 49df66b7993c80b80c7eb9a84ba5b3410c8296a0 (git)
Linux	Linux	Affected: 2.6.38 Unaffected: 0 , < 2.6.38 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/mesh-interface.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "58799078afebd5115e052bf69ad6697f9759dd6f",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
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            {
              "lessThan": "38cd10b0aeec755d89f78722a2b83f4088ff0cb0",
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              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "e6640923afee619d9fa82b07394dc9498e202304",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "6b4f521e01257387906f8b969ad3450d8208d4e2",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "9e16b6751a8206de0b865d99bb02771e6751d12d",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
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              "status": "affected",
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.38"
            },
            {
              "lessThan": "2.6.38",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.38",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
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                {
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                {
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                {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: ensure minimal ethernet header on TX\n\nAs documented in commit 8bd67ebb50c0 (\"net: bridge: xmit: make sure we have\nat least eth header len bytes\"), it is possible by for a local user with\neBPF TC hook access to attach a tc filter which truncates the packet and\nredirects to an batadv interface. But the code assumes that at least\nETH_HLEN bytes are available and thus might read outside of the available\nbuffer.\n\nThe batadv_interface_tx() must therefore always check itself if enough data\nis available for the ethernet header and don\u0027t rely on min_header_len."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - Reachable only via local ndo_start_xmit on a batadv netdev after a TC/eBPF program (bpf_redirect/bpf_clone_redirect or mirred) truncates an skb below ETH_HLEN; there is no credible remote or adjacent path without local TC/BPF control.\nAC:L - An attacker with CAP_NET_ADMIN can reliably attach a TC clsact filter, shrink the skb (e.g. bpf_skb_adjust_room), and redirect to bat0; no race or victim state beyond attacker-controlled namespace setup is required.\nPR:L - Exploitation requires CAP_NET_ADMIN to attach TC/BPF programs and create/use a batadv interface; this capability is obtainable by unprivileged users inside user/network namespaces (unshare -Urn), not only init-namespace root.\nUI:N - No victim interaction is needed; the attacker triggers the bug by installing the TC filter and transmitting or test-running the crafted skb themselves.\nS:U - Impact remains within the kernel/network stack security authority (memory disclosure, mesh state corruption, crash); it does not by itself cross a VM, container, or IOMMU boundary.\nC:H - Missing ETH_HLEN validation causes an out-of-bounds read of up to 12 bytes past skb-\u003etail via eth_hdr(), exposing adjacent slab/uninitialized kernel memory and enabling heap grooming for further exploitation.\nI:H - OOB-read ethernet header fields drive batadv_tt_local_add, DAT/ARP snooping, and mesh forwarding decisions, corrupting translation/routing state; kernel OOB reads are also commonly chained into arbitrary write primitives.\nA:H - Reading beyond the skb buffer can trigger kernel oops/panic (as seen in the analogous bridge/bpf_redirect syzbot reports) and enables repeated, attacker-controlled crashes on mesh nodes running batman-adv."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:41:49.683Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0"
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      "title": "batman-adv: ensure minimal ethernet header on TX",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72232",
    "datePublished": "2026-08-15T05:54:22.864Z",
    "dateReserved": "2026-08-09T03:40:39.913Z",
    "dateUpdated": "2026-08-17T05:41:49.683Z",
    "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.

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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GHSA-348F-JXJQ-8XPV

CVE-2026-72232 (GCVE-0-2026-72232)

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