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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-53027

fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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!

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 406a037d93b769bca248476bd14bbe548dc1ec35 to < 543093f65318d012850e548b241f85381b14d643affected
  • c380b52f6c5702cc4bdda5e6d456d6c19a201a0b to < ea59d9dbc5504e29d420ac4aab774cbce39b0e69affected
  • c380b52f6c5702cc4bdda5e6d456d6c19a201a0b to < d68a14450783ecc5fddae957ac4e1c546dfcfb73affected
  • c380b52f6c5702cc4bdda5e6d456d6c19a201a0b to < 08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147affected
  • c380b52f6c5702cc4bdda5e6d456d6c19a201a0b to < 2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54affected
  • c380b52f6c5702cc4bdda5e6d456d6c19a201a0b to < d7ea8495fd307b58f8867acd81a1b40075b1d3baaffected
  • 6.1.132 to < 6.1.191affected

Linux Linux

Default version status: affected

  • 6.2affected
  • 0 to < 6.2unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References