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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:41
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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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          "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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              "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."
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        "shortName": "Linux"
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    "dateReserved": "2026-08-09T03:40:39.913Z",
    "dateUpdated": "2026-08-17T05:41:49.683Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T17:32:25+00:00",
      "cve": "CVE-2026-72232",
      "id": "CVE-2026-72232",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: ensure minimal ethernet header on TX",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72232.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.