GHSA-HPV2-JQ93-768M

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-19 09:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ntfs: fix off-by-one in mapping pairs decoding bounds checks

In ntfs_mapping_pairs_decompress(), attr_end points one byte past the end of the attribute record:

attr_end = (u8 *)attr + le32_to_cpu(attr->length);

The two bounds checks validating that mapping pair data bytes fit within the attribute use strict greater-than (>), which allows a one-byte out-of-bounds read when the data extends exactly to attr_end:

b = *buf & 0xf; if (b) { if (unlikely(buf + b > attr_end)) // off-by-one goto io_error; for (deltaxcn = (s8)buf[b--]; b; b--) deltaxcn = (deltaxcn << 8) + buf[b]; }

When buf + b == attr_end, the check evaluates to false and buf[b] reads one byte past the valid attribute boundary. The same pattern appears in the LCN delta bytes check.

Fix both checks to use >= so that buf[b] at exactly attr_end is correctly rejected as out of bounds.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72210"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:39Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix off-by-one in mapping pairs decoding bounds checks\n\nIn ntfs_mapping_pairs_decompress(), attr_end points one byte past the\nend of the attribute record:\n\n    attr_end = (u8 *)attr + le32_to_cpu(attr-\u003elength);\n\nThe two bounds checks validating that mapping pair data bytes fit within\nthe attribute use strict greater-than (\u003e), which allows a one-byte\nout-of-bounds read when the data extends exactly to attr_end:\n\n  b = *buf \u0026 0xf;\n  if (b) {\n      if (unlikely(buf + b \u003e attr_end))   // off-by-one\n          goto io_error;\n      for (deltaxcn = (s8)buf[b--]; b; b--)\n          deltaxcn = (deltaxcn \u003c\u003c 8) + buf[b];\n  }\n\nWhen buf + b == attr_end, the check evaluates to false and buf[b] reads\none byte past the valid attribute boundary. The same pattern appears in\nthe LCN delta bytes check.\n\nFix both checks to use \u003e= so that buf[b] at exactly attr_end is\ncorrectly rejected as out of bounds.",
  "id": "GHSA-hpv2-jq93-768m",
  "modified": "2026-08-19T09:31:22Z",
  "published": "2026-08-15T06:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72210"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18760a74ef7c28df93726445b5595162e62ed341"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfe835e535fe0aa5767fdd8116f62e835ba50b55"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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