apparmor: Fix double free of ns_name in aa_replace_profiles()

{
  "id": "96dff7dac026b2c98facfd1c3062a9846e07cc1f897d1264c62e71bff4d1724c",
  "url": "https://osv.dev/vulnerability/CVE-2026-23408",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "apparmor: Fix double free of ns_name in aa_replace_profiles()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix double free of ns_name in aa_replace_profiles() if ns_name is NULL after 1071 error = aa_unpack(udata, &lh, &ns_name); and if ent->ns_name contains an ns_name in 1089 } else if (ent->ns_name) { then ns_name is assigned the ent->ns_name 1095 ns_name = ent->ns_name; however ent->ns_name is freed at 1262 aa_load_ent_free(ent); and then again when freeing ns_name at 1270 kfree(ns_name); Fix this by NULLing out ent->ns_name after it is transferred to ns_name \")",
    "evidence": "osv:CVE-2026-23408",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.253",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.203",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.169",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.77",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-23408",
      "aliases": [
        "CVE-2026-23408"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "145a0ef21c8e944957f58e2c8ffcd8a10f46266a"
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                {
                  "fixed": "c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689"
                },
                {
                  "fixed": "c053ae381ce227577567d1ef10090ce7506d7a28"
                },
                {
                  "fixed": "35f4caec1352054b9a61cfdf2bf1898073637aa0"
                },
                {
                  "fixed": "55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a"
                },
                {
                  "fixed": "86feeccd6b93ed94bd6655f30de80f163f8d5a45"
                },
                {
                  "fixed": "7998ab3010d2317643f91828f1853d954ef31387"
                },
                {
                  "fixed": "18b5233e860c294a847ee07869d93c0b8673a54b"
                },
                {
                  "fixed": "5df0c44e8f5f619d3beb871207aded7c78414502"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23408.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
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                {
                  "fixed": "5.10.253"
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              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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                  "introduced": "5.16.0"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.13.0"
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            {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23408.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.709741042Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/18b5233e860c294a847ee07869d93c0b8673a54b",
        "https://git.kernel.org/stable/c/35f4caec1352054b9a61cfdf2bf1898073637aa0",
        "https://git.kernel.org/stable/c/55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a",
        "https://git.kernel.org/stable/c/5df0c44e8f5f619d3beb871207aded7c78414502",
        "https://git.kernel.org/stable/c/7998ab3010d2317643f91828f1853d954ef31387",
        "https://git.kernel.org/stable/c/86feeccd6b93ed94bd6655f30de80f163f8d5a45",
        "https://git.kernel.org/stable/c/c053ae381ce227577567d1ef10090ce7506d7a28",
        "https://git.kernel.org/stable/c/c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23408.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23408",
        "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/2026/23xxx/CVE-2026-23408.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23408",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510208,
  "published_at": "2026-04-01T08:36:37.873+00:00"
}