ghsa-2j47-jhvw-fgmm
Vulnerability from github
Published
2025-09-22 21:30
Modified
2025-09-22 21:30
Details

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

batman-adv: fix OOB read/write in network-coding decode

batadv_nc_skb_decode_packet() trusts coded_len and checks only against skb->len. XOR starts at sizeof(struct batadv_unicast_packet), reducing payload headroom, and the source skb length is not verified, allowing an out-of-bounds read and a small out-of-bounds write.

Validate that coded_len fits within the payload area of both destination and source sk_buffs before XORing.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39839"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-19T16:15:42Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix OOB read/write in network-coding decode\n\nbatadv_nc_skb_decode_packet() trusts coded_len and checks only against\nskb-\u003elen. XOR starts at sizeof(struct batadv_unicast_packet), reducing\npayload headroom, and the source skb length is not verified, allowing an\nout-of-bounds read and a small out-of-bounds write.\n\nValidate that coded_len fits within the payload area of both destination\nand source sk_buffs before XORing.",
  "id": "GHSA-2j47-jhvw-fgmm",
  "modified": "2025-09-22T21:30:17Z",
  "published": "2025-09-22T21:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39839"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e36c6c8dc8023b4bbe9a16e819f9998b9b6a183"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20080709457bc1e920eb002483d7d981d9b2ac1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30fc47248f02b8a14a61df469e1da4704be1a19f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d334bce9fad58cf328d8fa14ea1fff855819863"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a67c6397fcb7e842d3c595243049940970541c48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb37252c9af1cb250f34735ee98f80b46be3cef1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d77b6ff0ce35a6d0b0b7b9581bc3f76d041d4087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dce6c2aa70e94c04c523b375dfcc664d7a0a560a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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