CVE-2026-72478 (GCVE-0-2026-72478)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-10-16 18:55
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 425de2aba0d061b3e715d51a3b1992c112ed5b99
Version: bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9
Version: e64f7dfcaff79e7dfff9121a382dd77f9b462f62
Version: d3012690a7065d9ca86521a525ad11e8af491d45
Version: b62567bca47408e6739dee75f02a2113548af875
Version: b62567bca47408e6739dee75f02a2113548af875
Version: bbad75336870b51b81979b97613746237fcb02fe
Version: 41aadf5cb482793a24e05aa136224e179a778586
Version: 6.1.175   ≤
Version: 6.6.140   ≤
Version: 6.12.86   ≤
Version: 6.18.27   ≤
Version: 5.15.209   ≤
Version: 7.0.4   ≤
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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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    "cveId": "CVE-2026-72478",
    "datePublished": "2026-08-15T05:57:17.679Z",
    "dateReserved": "2026-08-09T03:40:39.935Z",
    "dateUpdated": "2026-10-16T18:55:26.034Z",
    "state": "PUBLISHED"
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"425de2aba0d061b3e715d51a3b1992c112ed5b99\", \"lessThan\": \"c69b9003332917b652175d5fa9d84158c5ed8617\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9\", \"lessThan\": \"8afc24a884aff6a6f08028bd779ee65c40054455\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e64f7dfcaff79e7dfff9121a382dd77f9b462f62\", \"lessThan\": \"c23083b472a720c3f60b147db05b25b751c7c1bf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d3012690a7065d9ca86521a525ad11e8af491d45\", \"lessThan\": \"a31893206588374d7d16fad387189d8165c7efd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b62567bca47408e6739dee75f02a2113548af875\", \"lessThan\": \"41081202eb823f5b27ff164b12010b24428100ad\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b62567bca47408e6739dee75f02a2113548af875\", \"lessThan\": \"bb11485a87fbb2254b62cfed630b699d50e57da8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bbad75336870b51b81979b97613746237fcb02fe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"41aadf5cb482793a24e05aa136224e179a778586\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6.1.175\", \"lessThan\": \"6.1.178\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.140\", \"lessThan\": \"6.6.145\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.12.86\", \"lessThan\": \"6.12.97\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.18.27\", \"lessThan\": \"6.18.40\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.209\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"7.0.4\", \"lessThan\": \"7.1\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/ntfs3/fslog.c\", \"fs/ntfs3/ntfs_fs.h\", \"fs/ntfs3/run.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"7.1\", \"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\", \"fs/ntfs3/ntfs_fs.h\", \"fs/ntfs3/run.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c69b9003332917b652175d5fa9d84158c5ed8617\"}, {\"url\": \"https://git.kernel.org/stable/c/8afc24a884aff6a6f08028bd779ee65c40054455\"}, {\"url\": \"https://git.kernel.org/stable/c/c23083b472a720c3f60b147db05b25b751c7c1bf\"}, {\"url\": \"https://git.kernel.org/stable/c/a31893206588374d7d16fad387189d8165c7efd3\"}, {\"url\": \"https://git.kernel.org/stable/c/41081202eb823f5b27ff164b12010b24428100ad\"}, {\"url\": \"https://git.kernel.org/stable/c/bb11485a87fbb2254b62cfed630b699d50e57da8\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"6.1.175\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.6.140\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.12.86\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.18.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.209\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"7.0.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:44:42.810Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72478\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:26.034Z\", \"dateReserved\": \"2026-08-09T03:40:39.935Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:57:17.679Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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