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fs/ntfs3: terminate the cached volume label after UTF-8 conversion

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: terminate the cached volume label after UTF-8 conversion ntfs_fill_super() loads the on-disk volume label with utf16s_to_utf8s() and stores the result in sbi->volume.label. The converted label is later exposed through ntfs3_label_show() using %s, but utf16s_to_utf8s() only returns the number of bytes written and does not add a trailing NUL. If the converted label fills the entire fixed buffer, ntfs3_label_show() can read past the end of sbi->volume.label while looking for a terminator. Terminate the cached label explicitly after a successful conversion and clamp the exact-full case to the last byte of the buffer.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141, 7.0.10
CVEs
CVE-2026-53023
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 08:08 UTC · Revision 1

Source evidence

fs/ntfs3: terminate the cached volume label after UTF-8 conversion

core-osv · Original source

Published 24 Jun 2026, 16:29 UTC

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: terminate the cached volume label after UTF-8 conversion ntfs_fill_super() loads the on-disk volume label with utf16s_to_utf8s() and stores the result in sbi->volume.label. The converted label is later exposed through ntfs3_label_show() using %s, but utf16s_to_utf8s() only returns the number of bytes written and does not add a trailing NUL. If the converted label fills the entire fixed buffer, ntfs3_label_show() can read past the end of sbi->volume.label while looking for a terminator. Terminate the cached label explicitly after a successful conversion and clamp the exact-full case to the last byte of the buffer.

osv:CVE-2026-53023

Kernel

Fixed versions: 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Complete source record
{
  "id": "11536cf1a7d9c7604a04a8dc02629f4148bb607c7c8635b0c583478554aa3d2c",
  "url": "https://osv.dev/vulnerability/CVE-2026-53023",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs/ntfs3: terminate the cached volume label after UTF-8 conversion",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: terminate the cached volume label after UTF-8 conversion ntfs_fill_super() loads the on-disk volume label with utf16s_to_utf8s() and stores the result in sbi->volume.label. The converted label is later exposed through ntfs3_label_show() using %s, but utf16s_to_utf8s() only returns the number of bytes written and does not add a trailing NUL. If the converted label fills the entire fixed buffer, ntfs3_label_show() can read past the end of sbi->volume.label while looking for a terminator. Terminate the cached label explicitly after a successful conversion and clamp the exact-full case to the last byte of the buffer.",
    "evidence": "osv:CVE-2026-53023",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.209",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53023",
      "aliases": [
        "CVE-2026-53023"
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      "affected": [
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              "type": "GIT",
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                {
                  "fixed": "5cd0707b81cb4589f00aec5c4c1288bd0980d2a4"
                },
                {
                  "fixed": "a6cd43fe9b083fa23fe1595666d5738856cb261a"
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              ]
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          ],
          "database_specific": {
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "fixed": "6.1.175"
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            {
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                {
                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.141"
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            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.7.0"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53023.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.260130608Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0b11fcbe80a59acdf58337d80ebb5f72201d73d6",
        "https://git.kernel.org/stable/c/32b0686369e0afbb3549a0d93e2d8517da84cd30",
        "https://git.kernel.org/stable/c/54d564b762389679e2f8fb9eeb20af7e82371e1c",
        "https://git.kernel.org/stable/c/5cd0707b81cb4589f00aec5c4c1288bd0980d2a4",
        "https://git.kernel.org/stable/c/6136bbb054f7ab9f51ae99915541633b18bcef90",
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        "https://git.kernel.org/stable/c/bc7a0c34c4ca259cfddf3bc18fc5b3c6411d26ed",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53023.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53023",
        "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/2026/53xxx/CVE-2026-53023.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53023",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493651,
  "published_at": "2026-06-24T16:29:32.44+00:00"
}