{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72197",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72197"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "fs/ntfs3: bound DeleteIndexEntryAllocation memmove length",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound DeleteIndexEntryAllocation memmove length\n\nIn do_action()'s DeleteIndexEntryAllocation case, e->size comes\nfrom an on-disk INDEX_BUFFER entry.  When e->size makes\ne + e->size point past hdr + hdr->used,\nPtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t\nthat is silently cast to a quasi-infinite size_t when passed\nto memmove().  The memmove then walks past the destination\nbuffer.\n\nThe sibling DeleteIndexEntryRoot case at fslog.c:3540-3543\nalready carries the corresponding guard:\n\n\tif (PtrOffset(e1, Add2Ptr(hdr, used)) < esize ||\n\t    Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) ||\n\t    used + esize > le32_to_cpu(hdr->total)) {\n\t\tgoto dirty_vol;\n\t}\n\nApply the same shape to the allocation-path case.  Also reject\nesize == 0: memmove(e, e, ...) is a no-op and leaves\nhdr->used unchanged, hiding a malformed entry from the\nexisting check_index_header() walk.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 by\nmounting a crafted NTFS image: the unguarded memmove takes a\nlength of 0xffffffffffffff00 and the kernel oopses in\nmemmove+0x81/0x1a0 on the do_action+0x36a2 frame.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.12.97"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
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          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
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            "assessment": "commit ancestry (strak rule)",
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      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72197"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f383aae59ec3994c14804f4191c59038b206be81"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc4626bb3656362de8b0ecd56605d47a19ec3518"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Reachable only by mounting attacker-controlled NTFS media via the local mount syscall path (path_mount\u2192ntfs_fill_super\u2192ntfs_loadlog_and_replay\u2192log_replay\u2192do_action); ntfs3 parses on-disk $LogFile redo records, not remote network packets.\nAC:L - The attacker fully controls crafted $LogFile DeleteIndexEntryAllocation redo data and INDEX_BUFFER entry sizes on disk, so the PtrOffset underflow to ~0xffffffffffffff00 and subsequent memmove OOB are deterministic with no race or uncontrollable layout preconditions.\nPR:N - No privileges on the target are required; exploitation only needs a malicious NTFS image presented to ntfs3 (USB/loop/NBD block device) that root, udisks2/systemd automount, or an image-handling service mounts, matching the kernel CNA model for crafted-filesystem bugs.\nUI:N - On desktops/kiosks/automotive systems where udisks2 or systemd automounts removable NTFS media, inserting or attaching the crafted image triggers log_replay during mount with no further deliberate victim action beyond routine media handling.\nS:U - The quasi-infinite memmove corrupts kernel heap memory within the host OS security authority during ntfs3 journal replay; this is standard kernel memory corruption, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The unchecked memmove length (~0xffffffffffffff00) performs a massive out-of-bounds read from beyond the kmalloc INDEX_BUFFER scratch buffer, exposing adjacent slab/heap contents and satisfying OOB-read/arbitrary-disclosure guidance even though KASAN reports an oops in memmove.\nI:H - The same memmove writes far past the destination INDEX_BUFFER allocation in kernel heap, yielding a large out-of-bounds write primitive that can corrupt adjacent kernel objects and be leveraged for control-flow hijacking or privilege escalation.\nA:H - Reproduced by mounting a crafted NTFS image under UML+KASAN, the unbounded memmove oopses the kernel in memmove from do_action; such heap corruption reliably threatens panic/oops and full denial of service on mount."
    }
  }
}