CVE-2023-32246 (GCVE-0-2023-32246)
Vulnerability from cvelistv5
Published
2025-08-16 13:22
Modified
2025-08-16 13:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: call rcu_barrier() in ksmbd_server_exit() racy issue is triggered the bug by racing between closing a connection and rmmod. In ksmbd, rcu_barrier() is not called at module unload time, so nothing prevents ksmbd from getting unloaded while it still has RCU callbacks pending. It leads to trigger unintended execution of kernel code locally and use to defeat protections such as Kernel Lockdown
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ksmbd/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "5.15.111",
              "versionType": "semver"
            },
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              "version": "6.1.28",
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              "version": "6.4",
              "versionType": "original_commit_for_fix"
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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\nksmbd: call rcu_barrier() in ksmbd_server_exit()\n\nracy issue is triggered the bug by racing between closing a connection\nand rmmod. In ksmbd, rcu_barrier() is not called at module unload time,\nso nothing prevents ksmbd from getting unloaded while it still has RCU\ncallbacks pending. It leads to trigger unintended execution of kernel\ncode locally and use to defeat protections such as Kernel Lockdown"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-16T13:22:09.212Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c053e389db0d892e2ff5a60ec5e533b976503795"
        },
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          "url": "https://git.kernel.org/stable/c/b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5"
        }
      ],
      "title": "ksmbd: call rcu_barrier() in ksmbd_server_exit()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-32246",
    "datePublished": "2025-08-16T13:22:09.212Z",
    "dateReserved": "2023-05-05T10:00:07.894Z",
    "dateUpdated": "2025-08-16T13:22:09.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-32246\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-16T14:15:26.393\",\"lastModified\":\"2025-08-18T20:16:28.750\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: call rcu_barrier() in ksmbd_server_exit()\\n\\nracy issue is triggered the bug by racing between closing a connection\\nand rmmod. In ksmbd, rcu_barrier() is not called at module unload time,\\nso nothing prevents ksmbd from getting unloaded while it still has RCU\\ncallbacks pending. It leads to trigger unintended execution of kernel\\ncode locally and use to defeat protections such as Kernel Lockdown\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: el problema de la llamada a rcu_barrier() en ksmbd_server_exit() desencadena el error al acelerarse entre el cierre de una conexi\u00f3n y rmmod. En ksmbd, rcu_barrier() no se llama al descargar el m\u00f3dulo, por lo que nada impide que ksmbd se descargue mientras a\u00fan tenga devoluciones de llamada de RCU pendientes. Esto provoca la ejecuci\u00f3n involuntaria de c\u00f3digo del kernel localmente y se utiliza para burlar protecciones como el bloqueo del kernel.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5a7090ccc242ab009ee7769e9d7fad6644dbe9bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c053e389db0d892e2ff5a60ec5e533b976503795\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4174505016a3b2996eb7ff1530dcabbf15d47b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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