CVE-2026-72478 (GCVE-0-2026-72478)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
fs/ntfs3: add bounds check to run_get_highest_vcn()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: add bounds check to run_get_highest_vcn() run_get_highest_vcn() parses a packed NTFS mapping-pairs buffer without any length bound, relying solely on a 0x00 terminator to stop. A crafted $LogFile UpdateMappingPairs record whose embedded attribute contains mapping-pairs runs without a terminator causes the function to read past the slab allocation, triggering a KASAN slab-out-of-bounds read on mount. The sibling function run_unpack() received an analogous bounds-check in commit b62567bca474 ("ntfs3: add buffer boundary checks to run_unpack()"), but run_get_highest_vcn() was missed. Take a run_buf_size parameter and reject any run header whose payload would extend past the buffer end, mirroring the pattern used by run_unpack(). The caller in fslog.c passes the remaining attribute bytes after the mapping-pairs offset. KASAN report (on mainline v7.1 merge window HEAD): BUG: KASAN: slab-out-of-bounds in run_get_highest_vcn+0x3c0/0x410 Read of size 1 at addr ffff88800e2d5400 by task mount/72 Call Trace: run_get_highest_vcn+0x3c0/0x410 do_action.isra.0+0x3ba8/0x7b50 log_replay+0x9ddd/0x10200 ntfs_loadlog_and_replay+0x4ad/0x610 ntfs_fill_super+0x214a/0x4540
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 425de2aba0d061b3e715d51a3b1992c112ed5b99 , < c69b9003332917b652175d5fa9d84158c5ed8617 (git)
Affected: bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 , < 8afc24a884aff6a6f08028bd779ee65c40054455 (git)
Affected: e64f7dfcaff79e7dfff9121a382dd77f9b462f62 , < c23083b472a720c3f60b147db05b25b751c7c1bf (git)
Affected: d3012690a7065d9ca86521a525ad11e8af491d45 , < a31893206588374d7d16fad387189d8165c7efd3 (git)
Affected: b62567bca47408e6739dee75f02a2113548af875 , < 41081202eb823f5b27ff164b12010b24428100ad (git)
Affected: b62567bca47408e6739dee75f02a2113548af875 , < bb11485a87fbb2254b62cfed630b699d50e57da8 (git)
Affected: bbad75336870b51b81979b97613746237fcb02fe (git)
Affected: 41aadf5cb482793a24e05aa136224e179a778586 (git)
Affected: 6.1.175 , < 6.1.178 (semver)
Affected: 6.6.140 , < 6.6.145 (semver)
Affected: 6.12.86 , < 6.12.97 (semver)
Affected: 6.18.27 , < 6.18.40 (semver)
Affected: 5.15.209 , < 5.16 (semver)
Affected: 7.0.4 , < 7.1 (semver)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: add bounds check to run_get_highest_vcn()\n\nrun_get_highest_vcn() parses a packed NTFS mapping-pairs buffer without\nany length bound, relying solely on a 0x00 terminator to stop.  A\ncrafted $LogFile UpdateMappingPairs record whose embedded attribute\ncontains mapping-pairs runs without a terminator causes the function to\nread past the slab allocation, triggering a KASAN slab-out-of-bounds\nread on mount.\n\nThe sibling function run_unpack() received an analogous bounds-check in\ncommit b62567bca474 (\"ntfs3: add buffer boundary checks to run_unpack()\"),\nbut run_get_highest_vcn() was missed.\n\nTake a run_buf_size parameter and reject any run header whose payload\nwould extend past the buffer end, mirroring the pattern used by\nrun_unpack().  The caller in fslog.c passes the remaining attribute\nbytes after the mapping-pairs offset.\n\nKASAN report (on mainline v7.1 merge window HEAD):\n\n  BUG: KASAN: slab-out-of-bounds in run_get_highest_vcn+0x3c0/0x410\n  Read of size 1 at addr ffff88800e2d5400 by task mount/72\n  Call Trace:\n   run_get_highest_vcn+0x3c0/0x410\n   do_action.isra.0+0x3ba8/0x7b50\n   log_replay+0x9ddd/0x10200\n   ntfs_loadlog_and_replay+0x4ad/0x610\n   ntfs_fill_super+0x214a/0x4540"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - mount(2)/get_tree_bdev on a crafted NTFS block device or loop image reaches ntfs_fill_super()\u2192ntfs_loadlog_and_replay()\u2192log_replay()\u2192do_action(UpdateMappingPairs)\u2192run_get_highest_vcn(); no network handler parses $LogFile.\nAC:L - The attacker fully controls the on-disk $LogFile UpdateMappingPairs record and embedded non-resident mapping-pairs bytes; omitting the 0x00 terminator deterministically drives the unbounded parser past the attribute buffer on the first replay mount with no race.\nPR:N - The attacker needs no account or privilege on the victim; supplying a malicious NTFS image on USB/removable media, a disk image, or shared storage is sufficient for udisks2/systemd automount or an administrator mount to reach journal replay.\nUI:N - Desktop/kiosk/shared-workstation automounters mount attacker-supplied NTFS media and run $LogFile replay without the user opening files or running commands; insertion of the crafted volume is sufficient to trigger parsing on mount.\nS:U - Slab out-of-bounds reads and resulting mount-time kernel faults stay within the host kernel security authority; no VM escape, IOMMU bypass, or cross-boundary scope change.\nC:H - run_get_highest_vcn() scans mapping pairs with no length bound, performing slab out-of-bounds byte reads via run_unpack_s64(); kernel guidance treats heap out-of-bounds reads as enabling broad adjacent-slab information disclosure.\nI:H - Parsed run lengths and offsets come from attacker-chosen and out-of-bounds heap bytes and, if the loop terminates, are written into attr-\u003enres.evcn during log replay, corrupting non-resident extent metadata and redirecting later replayed cluster I/O.\nA:H - The demonstrated KASAN slab-out-of-bounds read in the mount task can fault into unmapped adjacent memory, producing a kernel oops/panic and denying service until reboot."
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      "title": "fs/ntfs3: add bounds check to run_get_highest_vcn()",
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    "cveId": "CVE-2026-72478",
    "datePublished": "2026-08-15T05:57:17.679Z",
    "dateReserved": "2026-08-09T03:40:39.935Z",
    "dateUpdated": "2026-08-17T05:44:42.810Z",
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      "date": "2026-09-21",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: add bounds check to run_get_highest_vcn()\n\nrun_get_highest_vcn() parses a packed NTFS mapping-pairs buffer without\nany length bound, relying solely on a 0x00 terminator to stop.  A\ncrafted $LogFile UpdateMappingPairs record whose embedded attribute\ncontains mapping-pairs runs without a terminator causes the function to\nread past the slab allocation, triggering a KASAN slab-out-of-bounds\nread on mount.\n\nThe sibling function run_unpack() received an analogous bounds-check in\ncommit b62567bca474 (\"ntfs3: add buffer boundary checks to run_unpack()\"),\nbut run_get_highest_vcn() was missed.\n\nTake a run_buf_size parameter and reject any run header whose payload\nwould extend past the buffer end, mirroring the pattern used by\nrun_unpack().  The caller in fslog.c passes the remaining attribute\nbytes after the mapping-pairs offset.\n\nKASAN report (on mainline v7.1 merge window HEAD):\n\n  BUG: KASAN: slab-out-of-bounds in run_get_highest_vcn+0x3c0/0x410\n  Read of size 1 at addr ffff88800e2d5400 by task mount/72\n  Call Trace:\n   run_get_highest_vcn+0x3c0/0x410\n   do_action.isra.0+0x3ba8/0x7b50\n   log_replay+0x9ddd/0x10200\n   ntfs_loadlog_and_replay+0x4ad/0x610\n   ntfs_fill_super+0x214a/0x4540"
          }
        ],
        "id": "CVE-2026-72478",
        "lastModified": "2026-08-17T06:19:15.853",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:22:21.960",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/41081202eb823f5b27ff164b12010b24428100ad"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8afc24a884aff6a6f08028bd779ee65c40054455"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a31893206588374d7d16fad387189d8165c7efd3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bb11485a87fbb2254b62cfed630b699d50e57da8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c23083b472a720c3f60b147db05b25b751c7c1bf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c69b9003332917b652175d5fa9d84158c5ed8617"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:36:36+00:00",
      "cve": "CVE-2026-72478",
      "id": "CVE-2026-72478",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: add bounds check to run_get_highest_vcn()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72478.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.