CVE-2026-98687 (GCVE-0-2026-98687)
Vulnerability from cvelistv5
Published
2026-10-18 15:45
Modified
2026-10-30 12:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.
References
Impacted products
Vendor Product Version
Linux Linux Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
Version: d1ff70241a275133e1a0258b7c23588b122276c8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/xdomain.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Reject oversized XDomain properties responses\n\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer.  The XDomain length field is six bits wide,\nhowever, and a malicious peer can set it to 63.  After the fixed response\nfields are subtracted, the driver treats this as 48 data dwords.\n\nCommit 322e93448d90 (\"thunderbolt: Clamp XDomain response data copy to\nallocation size\") only bounds the copy against data_len.  If data_len is\nat least 48, memcpy() reads 192 bytes from the 180-byte res-\u003edata array,\ncausing a 12-byte heap out-of-bounds read.  Commit 4db2bd2ed478\n(\"thunderbolt: Limit XDomain response copy to actual frame size\") limits\nthe earlier copy but does not constrain this header-derived length.\n\nReject response data lengths that exceed the allocated source buffer\nbefore copying them into the assembled property block."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:45.242Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9fba032802b5858bc6186b34f8e966429ff155ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c028d2ae85eca86b82cab1163a9ac1187a2e666"
        },
        {
          "url": "https://git.kernel.org/stable/c/37ea4304bd9f57ebe719409f010915495467f05c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b270c1074860de74da0d6b5250fb06b359b9d509"
        },
        {
          "url": "https://git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa"
        },
        {
          "url": "https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f"
        }
      ],
      "title": "thunderbolt: Reject oversized XDomain properties responses",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98687",
    "datePublished": "2026-10-18T15:45:58.719Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-30T12:38:45.242Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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