CVE-2026-31609 (GCVE-0-2026-31609)
Vulnerability from cvelistv5
Published
2026-04-24 14:42
Modified
2026-04-27 14:04
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush() smbd_send_batch_flush() already calls smbd_free_send_io(), so we should not call it again after smbd_post_send() moved it to the batch list.
References
Impacted products
Vendor Product Version
Linux Linux Version: cca0526ef2344cab6944d7f441fc24e152da031b
Version: 37b5c06956183b65e6808b509cf637632016cdf7
Version: 21538121efe6c8c5b51c742fa02cbe820bc48714
Version: 21538121efe6c8c5b51c742fa02cbe820bc48714
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smbdirect.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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              "version": "0",
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      "cpeApplicability": [
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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\nsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()\n\nsmbd_send_batch_flush() already calls smbd_free_send_io(),\nso we should not call it again after smbd_post_send()\nmoved it to the batch list."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:04:22.299Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607"
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        {
          "url": "https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be"
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      ],
      "title": "smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31609",
    "datePublished": "2026-04-24T14:42:30.797Z",
    "dateReserved": "2026-03-09T15:48:24.122Z",
    "dateUpdated": "2026-04-27T14:04:22.299Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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