GHSA-R4HM-9CRW-6G4M

Vulnerability from github – Published: 2026-04-25 09:30 – Updated: 2026-04-27 15:30
VLAI?
Details

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.

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-2026-31683"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T09:16:02Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-r4hm-9crw-6g4m",
  "modified": "2026-04-27T15:30:51Z",
  "published": "2026-04-25T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31683"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d4aef630be9d5f9c1227d07669c26c4383b5ad0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ada20331f2df2a942d6b83ae1f04a304b642e2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67176c96f325837b0bb3e9538ca2eba414f447d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6755347c5f9bdd44dee80f692208b056fcd40a52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eda89a1bae0602aec8314ced299bb243b9f9aeef"
    }
  ],
  "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"
    }
  ]
}


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Detection rules are retrieved from Rulezet.