CVE-2026-52916 (GCVE-0-2026-52916)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI
Title
batman-adv: frag: disallow unicast fragment in fragment
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 0c208fa3859e3a33a1c38bebc41d021166e94ac8 (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < bcda4814dc6524283c0b958882cb963d75fe411d (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < aea54d0bbe156d5ab7d00d68f66149ff41f4612a (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < b54e459cf86943583c1aa2ee3081874e7ab1f5f3 (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 5418be6c2e117bf8a316582795a8e3ff90f45e5d (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 5895ad21c7059a652da83fb817510f7a1e962abf (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 7138c35c9ad39a2fca6264af6b87466471f04ffc (git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < bc62216dc8e221e3781afa14430f45208bfa9af9 (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/batman-adv/fragmentation.c"
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              "version": "0",
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              "version": "5.10.258",
              "versionType": "semver"
            },
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              "version": "5.15.209",
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              "version": "6.1.175",
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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: 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"
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          "url": "https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"
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      ],
      "title": "batman-adv: frag: disallow unicast fragment in fragment",
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    "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"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-52916",
      "date": "2026-06-29",
      "epss": "0.00177",
      "percentile": "0.0745"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/fragmentation.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"0c208fa3859e3a33a1c38bebc41d021166e94ac8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"bcda4814dc6524283c0b958882cb963d75fe411d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"aea54d0bbe156d5ab7d00d68f66149ff41f4612a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"b54e459cf86943583c1aa2ee3081874e7ab1f5f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"5418be6c2e117bf8a316582795a8e3ff90f45e5d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"5895ad21c7059a652da83fb817510f7a1e962abf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"7138c35c9ad39a2fca6264af6b87466471f04ffc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\"lessThan\":\"bc62216dc8e221e3781afa14430f45208bfa9af9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/fragmentation.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.