ext4: fix buffer_head leak in ext4_init_orphan_info

{
  "id": "9f26d823803ea54fbfc4bba20af419f5b829bc4fbb35899327e012823693c8bb",
  "url": "https://osv.dev/vulnerability/CVE-2026-92494",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix buffer_head leak in ext4_init_orphan_info",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.",
    "evidence": "osv:CVE-2026-92494",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-92494",
      "aliases": [
        "CVE-2026-92494"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "02f310fcf47fa9311d6ba2946a8d19e7d7d11f37"
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                {
                  "fixed": "a9a6ec1298f9bc134b2c5db27d25bb10603b7113"
                },
                {
                  "fixed": "35fc83c65faf7949f5701bb34b20f822560a7718"
                },
                {
                  "fixed": "74637f7fef030e5fb2e835b7dfeb05efdc48e0fe"
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                {
                  "fixed": "6ec53ccab0d691b3c73e03d930343ca45987e88d"
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                {
                  "fixed": "1399f102d8a1855c1a38506057306ec79d0787d9"
                },
                {
                  "fixed": "e1e342d9a561c016b8531ec1f4dcefaad9d64954"
                },
                {
                  "fixed": "05704335803b69c1bfa8637b7ada942bf2ee8a41"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92494.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.15.0"
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                  "introduced": "5.16.0"
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                  "fixed": "6.1.188"
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                  "introduced": "6.2.0"
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            {
              "type": "ECOSYSTEM",
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.13.0"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.6"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92494.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.976194893Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41",
        "https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9",
        "https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718",
        "https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d",
        "https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe",
        "https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113",
        "https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92494.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92494",
        "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/2026/92xxx/CVE-2026-92494.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92494",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492621,
  "published_at": "2026-09-17T16:10:10.073+00:00"
}