CVE-2026-31671 (GCVE-0-2026-31671)
Vulnerability from cvelistv5
Published
2026-04-24 14:45
Modified
2026-04-25 05:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_report() struct xfrm_user_report is a __u8 proto field followed by a struct xfrm_selector which means there is three "empty" bytes of padding, but the padding is never zeroed before copying to userspace. Fix that up by zeroing the structure before setting individual member variables.
References
Impacted products
Vendor Product Version
Linux Linux Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
Version: 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5
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{
  "containers": {
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          "programFiles": [
            "net/xfrm/xfrm_user.c"
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              "version": "0",
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm_user: fix info leak in build_report()\n\nstruct xfrm_user_report is a __u8 proto field followed by a struct\nxfrm_selector which means there is three \"empty\" bytes of padding, but\nthe padding is never zeroed before copying to userspace.  Fix that up by\nzeroing the structure before setting individual member variables."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-25T05:48:30.115Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88"
        },
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          "url": "https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe"
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          "url": "https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72"
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        {
          "url": "https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4"
        }
      ],
      "title": "xfrm_user: fix info leak in build_report()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31671",
    "datePublished": "2026-04-24T14:45:18.669Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-04-25T05:48:30.115Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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