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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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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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"
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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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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   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    "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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Tags
Taxonomy of the tags.





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.