CVE-2026-92494 (GCVE-0-2026-92494)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
Version: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37
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{
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          "programFiles": [
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix buffer_head leak in ext4_init_orphan_info\n\next4_init_orphan_info() reads orphan file blocks with ext4_bread()\nand stores the returned buffer_head in oi-\u003eof_binfo[i].ob_bh.\n\nIf ext4_bread() succeeds but the orphan block magic or checksum\nvalidation fails, the function jumps to out_free. However, the old\nout_free loop starts releasing buffers from i - 1, so the current\nbuffer_head at index i is skipped.\n\nThis leaks the buffer_head reference obtained by ext4_bread() on the\nbad magic and bad checksum error paths.\n\nFix this by tracking the number of successfully read buffer_heads and\nreleasing exactly those buffer_heads on the error path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:00.500Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113"
        },
        {
          "url": "https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718"
        },
        {
          "url": "https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954"
        },
        {
          "url": "https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41"
        }
      ],
      "title": "ext4: fix buffer_head leak in ext4_init_orphan_info",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92494",
    "datePublished": "2026-09-17T16:10:10.073Z",
    "dateReserved": "2026-09-16T12:21:13.871Z",
    "dateUpdated": "2026-10-19T09:04:00.500Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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