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fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <20260502154252.164586-1-jhapavitra98@gmail.com>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes, fixed conflicts]

Announced Source revision 1
Original source ↗

CVE-2026-72196

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-2026-72196

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": "9b3d8cc9d54fcded4de51b2b1026ae7182512077",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "9b7c28d8c61bdb041936222a09a708531a1c2921",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "0f13e823bf86bd1800168ea0bb5bca8b8500a81c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "d240cd98f5f7b65c90f6b2b6abe3232ccdc405ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "49c86dae0c0ccb8d98ddcdc46987259389c816dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "5e7b598660cfa8e5af172cf4c65cffc126333307",
        "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": "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-2026-72196

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32972 · Revision 1
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Publisher date
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