FKIE_CVE-2026-52916

Vulnerability from fkie_nvd - Published: 2026-06-24 08:16 - Updated: 2026-06-24 08:16
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/fragmentation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0c208fa3859e3a33a1c38bebc41d021166e94ac8",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "bcda4814dc6524283c0b958882cb963d75fe411d",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "aea54d0bbe156d5ab7d00d68f66149ff41f4612a",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "b54e459cf86943583c1aa2ee3081874e7ab1f5f3",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "5418be6c2e117bf8a316582795a8e3ff90f45e5d",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "5895ad21c7059a652da83fb817510f7a1e962abf",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "7138c35c9ad39a2fca6264af6b87466471f04ffc",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            },
            {
              "lessThan": "bc62216dc8e221e3781afa14430f45208bfa9af9",
              "status": "affected",
              "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/fragmentation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-52916",
  "lastModified": "2026-06-24T08:16:21.463",
  "metrics": {},
  "published": "2026-06-24T08:16:21.463",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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