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fs/ntfs3: bound DeleteIndexEntryAllocation memmove length

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length In do_action()'s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEX_BUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t that is silently cast to a quasi-infinite size_t when passed to memmove(). The memmove then walks past the destination buffer. The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard: if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) || used + esize > le32_to_cpu(hdr->total)) { goto dirty_vol; } Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing check_index_header() walk. Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the do_action+0x36a2 frame. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]

Announced Source revision 1
Original source ↗

CVE-2026-72197

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72197

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "b509b9613f20dc5b653d54bf78fab00d79cc43c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "4c8aac931c1cd70347961ba5157aa916448c6a25",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "f383aae59ec3994c14804f4191c59038b206be81",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "09fddd52c1b0cef2c086d61be8f3d5dc92e36565",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "554700c65d398276cb00a8ef95f1d5e00b9eff93",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "fc4626bb3656362de8b0ecd56605d47a19ec3518",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ntfs3/fslog.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/fslog.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72197

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32973 · Revision 1
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Publisher date
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