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fs/ntfs3: bound attr_off in UpdateResidentValue against data_off

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound attr_off in UpdateResidentValue against data_off In do_action()'s UpdateResidentValue case (fslog.c:3307), lrh->attr_off and lrh->redo_len come from the on-disk LRH. When they satisfy aoff + dlen < attr->res.data_off, the assignment attr->res.data_size = cpu_to_le32(aoff + dlen - data_off); underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1, data_off=0x18). Subsequent code that reads attr->res.data_size to walk the resident attribute payload would then read up to 4 GiB past the 1024-byte MFT record allocation. The existing mi_enum_attr() defense in fs/ntfs3/record.c:287 catches the corrupted data_size on the next attribute walk and fails the mount, but only on the path that walks all attributes. A read site that picks an attribute by name and reads its data_size without re-validating is not covered. Validate aoff against data_off and asize at the source. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe: with aoff=0x10 and data_off=0x18, the post-assignment data_size is 0xfffffff9 (mount then fails at -22 from mi_enum_attr). [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]

Announced Source revision 1
Original source ↗

CVE-2026-72195

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-2026-72195

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "ab8761676d638c5be170aaf91b7ffdd451236616",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "53c12f178f584dc5f836ffe2782138a6e9348ed9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "546518468e6c9ea469669eef78f8cc380ad6e2ca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "97758fd9756b5f09e9ddc6a5f6a569041acc8421",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "50b5e83384e7fed3d11d18b79ff350e9d6d89861",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "a89c66674283a0293c0f266dc57087a6114371a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "d1570c48f49a693974d000251030370ee2e83539",
        "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-2026-72195

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32971 · Revision 1
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