CVE-2026-52916 (GCVE-0-2026-52916)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-06-24 07:14
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
Version: 610bfc6bc99bc83680d190ebc69359a05fc7f605
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{
  "containers": {
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          "programFiles": [
            "net/batman-adv/fragmentation.c"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T07:14:13.221Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8"
        },
        {
          "url": "https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d"
        },
        {
          "url": "https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf"
        },
        {
          "url": "https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"
        }
      ],
      "title": "batman-adv: frag: disallow unicast fragment in fragment",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52916",
    "datePublished": "2026-06-24T07:14:13.221Z",
    "dateReserved": "2026-06-09T07:44:35.367Z",
    "dateUpdated": "2026-06-24T07:14:13.221Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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