net: airoha: Fix potential use-after-free in airoha_ppe_deinit()

{
  "id": "52f735552ddec83dd4f2d4394c729bf40c20d34d0e25e20697c8a58bbc05c9d8",
  "url": "https://osv.dev/vulnerability/CVE-2026-68332",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: airoha: Fix potential use-after-free in airoha_ppe_deinit()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: airoha: Fix potential use-after-free in airoha_ppe_deinit() airoha_ppe_deinit() replaces the NPU pointer with NULL via rcu_replace_pointer() but does not wait for existing RCU readers to exit before calling ppe_deinit() and airoha_npu_put(). This can cause a use-after-free if a reader in an RCU read-side critical section still holds a reference to the NPU when it is freed. The init path (airoha_ppe_init) already calls synchronize_rcu() after rcu_assign_pointer(), but the deinit path introduced in commit 6abcf751bc08 (\"net: airoha: Fix schedule while atomic in airoha_ppe_deinit()\") omitted the matching barrier when switching from rcu_read_lock()/rcu_dereference() to rcu_replace_pointer(). Add synchronize_rcu() before ppe_deinit() to ensure all existing RCU readers have completed before the NPU resources are released.",
    "evidence": "osv:CVE-2026-68332",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68332",
      "aliases": [
        "CVE-2026-68332"
      ],
      "affected": [
        {
          "ranges": [
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              "type": "GIT",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "introduced": "6.18.6"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68332.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
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              "type": "ECOSYSTEM",
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68332.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.775558438Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2484568a335cd7bda951c75b3a7d95ea36161ae7",
        "https://git.kernel.org/stable/c/46e3bed4b071095ecc9384a7b349e1908728531f",
        "https://git.kernel.org/stable/c/ad28c4f9e0eae4993cb3fde3e7cea330acd8b97c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68332.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68332",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68332.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68332",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505328,
  "published_at": "2026-08-10T12:03:08.525+00:00"
}