CVE-2026-31683 (GCVE-0-2026-31683)
Vulnerability from cvelistv5
Published
2026-04-25 08:47
Modified
2026-04-27 14:05
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: batman-adv: avoid OGM aggregation when skb tailroom is insufficient When OGM aggregation state is toggled at runtime, an existing forwarded packet may have been allocated with only packet_len bytes, while a later packet can still be selected for aggregation. Appending in this case can hit skb_put overflow conditions. Reject aggregation when the target skb tailroom cannot accommodate the new packet. The caller then falls back to creating a new forward packet instead of appending.
References
Impacted products
Vendor Product Version
Linux Linux Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
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{
  "containers": {
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          "programFiles": [
            "net/batman-adv/bat_iv_ogm.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: avoid OGM aggregation when skb tailroom is insufficient\n\nWhen OGM aggregation state is toggled at runtime, an existing forwarded\npacket may have been allocated with only packet_len bytes, while a later\npacket can still be selected for aggregation. Appending in this case can\nhit skb_put overflow conditions.\n\nReject aggregation when the target skb tailroom cannot accommodate the new\npacket. The caller then falls back to creating a new forward packet\ninstead of appending."
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:05:03.279Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/67176c96f325837b0bb3e9538ca2eba414f447d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/6755347c5f9bdd44dee80f692208b056fcd40a52"
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        {
          "url": "https://git.kernel.org/stable/c/1ada20331f2df2a942d6b83ae1f04a304b642e2a"
        },
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          "url": "https://git.kernel.org/stable/c/6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075"
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          "url": "https://git.kernel.org/stable/c/0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8"
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          "url": "https://git.kernel.org/stable/c/eda89a1bae0602aec8314ced299bb243b9f9aeef"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d4aef630be9d5f9c1227d07669c26c4383b5ad0"
        }
      ],
      "title": "batman-adv: avoid OGM aggregation when skb tailroom is insufficient",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31683",
    "datePublished": "2026-04-25T08:47:00.334Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-04-27T14:05:03.279Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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