CVE-2026-53027 (GCVE-0-2026-53027)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-07-24 14:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked() When a compressed or sparse attribute has its clusters frame-aligned, vcn is rounded down to the frame start using cmask, which can result in vcn != vcn0. In this case, vcn and vcn0 may reside in different attribute segments. The code already handles the case where vcn is in a different segment by loading its runs before allocation. However, it fails to load runs for vcn0 when vcn0 resides in a different segment than vcn. This causes run_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was never loaded into the in-memory run list, triggering the WARN_ON(1). Fix this by adding a missing check for vcn0 after the existing vcn segment check. If vcn0 falls outside the current segment range [svcn, evcn1), find and load the attribute segment containing vcn0 before performing the run lookup. The following scenario triggers the bug: attr_data_get_block_locked() vcn = vcn0 & cmask <- vcn != vcn0 after frame alignment load runs for vcn segment <- vcn0 segment not loaded! attr_allocate_clusters() <- allocation succeeds run_lookup_entry(vcn0) <- vcn0 not in run -> SPARSE_LCN WARN_ON(1) <- bug fires here!
References
Impacted products
Vendor Product Version
Linux Linux Version: c380b52f6c5702cc4bdda5e6d456d6c19a201a0b
Version: c380b52f6c5702cc4bdda5e6d456d6c19a201a0b
Version: c380b52f6c5702cc4bdda5e6d456d6c19a201a0b
Version: c380b52f6c5702cc4bdda5e6d456d6c19a201a0b
Version: c380b52f6c5702cc4bdda5e6d456d6c19a201a0b
Version: 406a037d93b769bca248476bd14bbe548dc1ec35
Version: 6.1.132   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()\n\nWhen a compressed or sparse attribute has its clusters frame-aligned,\nvcn is rounded down to the frame start using cmask, which can result\nin vcn != vcn0. In this case, vcn and vcn0 may reside in different\nattribute segments.\n\nThe code already handles the case where vcn is in a different segment\nby loading its runs before allocation. However, it fails to load runs\nfor vcn0 when vcn0 resides in a different segment than vcn. This causes\nrun_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was\nnever loaded into the in-memory run list, triggering the WARN_ON(1).\n\nFix this by adding a missing check for vcn0 after the existing vcn\nsegment check. If vcn0 falls outside the current segment range\n[svcn, evcn1), find and load the attribute segment containing vcn0\nbefore performing the run lookup.\n\nThe following scenario triggers the bug:\n  attr_data_get_block_locked()\n    vcn = vcn0 \u0026 cmask        \u003c- vcn != vcn0 after frame alignment\n    load runs for vcn segment \u003c- vcn0 segment not loaded!\n    attr_allocate_clusters()  \u003c- allocation succeeds\n    run_lookup_entry(vcn0)    \u003c- vcn0 not in run -\u003e SPARSE_LCN\n    WARN_ON(1)                \u003c- bug fires here!"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-24T14:33:47.674Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/ea59d9dbc5504e29d420ac4aab774cbce39b0e69"
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          "url": "https://git.kernel.org/stable/c/d68a14450783ecc5fddae957ac4e1c546dfcfb73"
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        },
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          "url": "https://git.kernel.org/stable/c/2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7ea8495fd307b58f8867acd81a1b40075b1d3ba"
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      ],
      "title": "fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53027",
    "datePublished": "2026-06-24T16:29:35.740Z",
    "dateReserved": "2026-06-09T07:44:35.379Z",
    "dateUpdated": "2026-07-24T14:33:47.674Z",
    "state": "PUBLISHED"
  },
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}


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