CVE-2026-92494 (GCVE-0-2026-92494)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10
VLAI
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < a9a6ec1298f9bc134b2c5db27d25bb10603b7113 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 35fc83c65faf7949f5701bb34b20f822560a7718 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 6ec53ccab0d691b3c73e03d930343ca45987e88d (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 1399f102d8a1855c1a38506057306ec79d0787d9 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < e1e342d9a561c016b8531ec1f4dcefaad9d64954 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 05704335803b69c1bfa8637b7ada942bf2ee8a41 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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": {
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    "dateReserved": "2026-09-16T12:21:13.871Z",
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          }
        ],
        "id": "CVE-2026-92494",
        "lastModified": "2026-09-17T17:17:51.547",
        "metrics": {},
        "published": "2026-09-17T17:17:51.547",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-23T14:10:07+00:00",
      "cve": "CVE-2026-92494",
      "id": "CVE-2026-92494",
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      "product_status:known_affected": "185",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: ext4: fix buffer_head leak in ext4_init_orphan_info",
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      "current_release_date": "2026-09-22T16:26:55Z",
      "cve": "CVE-2026-92494",
      "id": "CVE-2026-92494",
      "initial_release_date": "2026-09-22T16:26:55Z",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-92494",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-92494.json",
      "version": "2"
    }
  }
}



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