CVE-2026-72198ntfs: reject non-resident records for resident-only attributes

Official description

In the Linux kernel, the following vulnerability has been resolved: ntfs: reject non-resident records for resident-only attributes The shared lookup-time attribute validator rejects non-resident $FILE_NAME and $VOLUME_NAME records because their formats require resident values and callers handle returned records as resident attributes. Other resident-only attribute types still pass through the generic non-resident mapping-pairs checks. That leaves real resident/non-resident union confusion paths. Inode load looks up $STANDARD_INFORMATION and then reads data.resident.value_offset without checking a->non_resident. ntfs_inode_sync_standard_information() does the same when updating the standard information value. ntfs_write_volume_flags() also looks up $VOLUME_INFORMATION and reads data.resident.value_offset directly. $INDEX_ROOT callers in dir.c and index.c depend on the same lookup contract before consuming the resident index root value. Reject non-resident records for all resident-only attribute types in the shared validator. Keep the existing $FILE_NAME and $VOLUME_NAME behavior, but factor it through a helper and extend it to $STANDARD_INFORMATION, $OBJECT_ID, $VOLUME_INFORMATION, $INDEX_ROOT, and $EA_INFORMATION. For $OBJECT_ID and $EA_INFORMATION this is contract hardening for resident-only formats; this patch only rejects the non-resident form and does not add new resident value validation for those types.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a
• https://git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f
• https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89
• https://git.kernel.org/stable/c/b54c9beb90e570bae17a9c18442aeeaf17165ccb
• https://git.kernel.org/stable/c/097cdfd0a55df5af82c9753833f39a8bfadbcfcb