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fs: ntfs3: check return value of indx_find to avoid infinite loop

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: check return value of indx_find to avoid infinite loop We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash. This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6, 6.6.128
CVEs
CVE-2025-71266
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 19:46 UTC · Revision 1

Source evidence

fs: ntfs3: check return value of indx_find to avoid infinite loop

core-osv · Original source

Published 18 Mar 2026, 10:05 UTC

In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: check return value of indx_find to avoid infinite loop We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash. This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.

osv:CVE-2025-71266

Kernel

Fixed versions: 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6

Complete source record
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  "id": "b5558bb6ffb76eacc03573d77310cd5ed470b8af7b0285015a3648b5f6925a74",
  "url": "https://osv.dev/vulnerability/CVE-2025-71266",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs: ntfs3: check return value of indx_find to avoid infinite loop",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: check return value of indx_find to avoid infinite loop We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash. This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.",
    "evidence": "osv:CVE-2025-71266",
    "products": [
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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                  "introduced": "6.13.0"
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            {
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          ],
          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:23.189534203Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c",
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        "https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10",
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        "https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71266.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-71266",
        "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/2025/71xxx/CVE-2025-71266.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2025-71266",
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489359,
  "published_at": "2026-03-18T10:05:02.997+00:00"
}