GHSA-7CG4-79F4-7W2G

Vulnerability from github – Published: 2026-06-24 09:30 – Updated: 2026-06-24 09:30
VLAI
Details

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

batman-adv: frag: disallow unicast fragment in fragment

batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a BATADV_UNICAST_FRAG packet is received. Once all fragments are collected and the packet is reassembled, batadv_recv_frag_packet() calls batadv_batman_skb_recv() again to process the defragmented payload.

A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting). Each nesting level recurses through batadv_batman_skb_recv() without bound, growing the kernel stack until it is exhausted.

Since refragmentation or fragments in fragments are not actually allowed, discard all packets which are still BATADV_UNICAST_FRAG packets after the defragmentation process.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52916"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T08:16:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: frag: disallow unicast fragment in fragment\n\nbatadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a\nBATADV_UNICAST_FRAG packet is received. Once all fragments are collected\nand the packet is reassembled, batadv_recv_frag_packet() calls\nbatadv_batman_skb_recv() again to process the defragmented payload.\n\nA malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled\npayload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).\nEach nesting level recurses through batadv_batman_skb_recv() without bound,\ngrowing the kernel stack until it is exhausted.\n\nSince refragmentation or fragments in fragments are not actually allowed,\ndiscard all packets which are still BATADV_UNICAST_FRAG packets after the\ndefragmentation process.",
  "id": "GHSA-7cg4-79f4-7w2g",
  "modified": "2026-06-24T09:30:48Z",
  "published": "2026-06-24T09:30:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52916"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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