{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31716",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31716"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "fs/ntfs3: validate rec->used in journal-replay file record check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate rec->used in journal-replay file record check\n\ncheck_file_record() validates rec->total against the record size but\nnever validates rec->used.  The do_action() journal-replay handlers read\nrec->used from disk and use it to compute memmove lengths:\n\n  DeleteAttribute:    memmove(attr, ..., used - asize - roff)\n  CreateAttribute:    memmove(..., attr, used - roff)\n  change_attr_size:   memmove(..., used - PtrOffset(rec, next))\n\nWhen rec->used is smaller than the offset of a validated attribute, or\nlarger than the record size, these subtractions can underflow allowing\nus to copy huge amounts of memory in to a 4kb buffer, generally\nconsidered a bad idea overall.\n\nThis requires a corrupted filesystem, which isn't a threat model the\nkernel really needs to worry about, but checking for such an obvious\nout-of-bounds value is good to keep things robust, especially on journal\nreplay\n\nFix this up by bounding rec->used correctly.\n\nThis is much like commit b2bc7c44ed17 (\"fs/ntfs3: Fix slab-out-of-bounds\nread in DeleteIndexEntryRoot\") which checked different values in this\nsame switch statement.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
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    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31716"
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      "scenario": "AV:L - The vulnerable ntfs3 journal replay code is reached when the target mounts or otherwise processes a crafted NTFS block device/image, which is a local filesystem parsing path rather than a network protocol. Physical removable media is one delivery route, but local image/block-device mounting is also reasonable.\nAC:L - The attacker controls the corrupt NTFS metadata and journal records, including the `rec->used` value and replay operation needed to trigger the underflowed `memmove()` length. No race or external timing condition is required.\nPR:N - Direct self-triggered mounting is gated by `CAP_SYS_ADMIN` and ntfs3 is not user-namespace mountable, but the highest reasonable scenario is an attacker-supplied NTFS image/media mounted by a victim or automounter. In that scenario the attacker needs no privileges on the target.\nUI:R - Exploitation requires the target system or user to mount/process the crafted NTFS filesystem so journal replay runs. The attacker cannot reach this ntfs3 path solely by sending packets.\nS:U - The impact remains within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug creates out-of-bounds memory movement from attacker-controlled on-disk metadata into a small MFT record buffer, and the resulting kernel memory corruption/read exposure is not tightly bounded. When uncertain, the higher impact is appropriate.\nI:H - The underflowed `memmove()` length can overflow/corrupt kernel heap memory adjacent to the MFT record buffer. Such out-of-bounds write-style memory corruption is potentially exploitable for arbitrary modification or code execution.\nA:H - The same oversized `memmove()` can cause kernel heap corruption, faults, oopses, or panics during mount-time journal replay. This is a high availability impact."
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}