{"api_version":"1","generated_at":"2026-08-22T18:23:03+00:00","cve":"CVE-2026-72478","urls":{"html":"https://cve.report/CVE-2026-72478","api":"https://cve.report/api/cve/CVE-2026-72478.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72478","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72478"},"summary":{"title":"fs/ntfs3: add bounds check to run_get_highest_vcn()","description":"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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:21","updated_at":"2026-08-17 06:19:15"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/c69b9003332917b652175d5fa9d84158c5ed8617","name":"https://git.kernel.org/stable/c/c69b9003332917b652175d5fa9d84158c5ed8617","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a31893206588374d7d16fad387189d8165c7efd3","name":"https://git.kernel.org/stable/c/a31893206588374d7d16fad387189d8165c7efd3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c23083b472a720c3f60b147db05b25b751c7c1bf","name":"https://git.kernel.org/stable/c/c23083b472a720c3f60b147db05b25b751c7c1bf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8afc24a884aff6a6f08028bd779ee65c40054455","name":"https://git.kernel.org/stable/c/8afc24a884aff6a6f08028bd779ee65c40054455","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bb11485a87fbb2254b62cfed630b699d50e57da8","name":"https://git.kernel.org/stable/c/bb11485a87fbb2254b62cfed630b699d50e57da8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/41081202eb823f5b27ff164b12010b24428100ad","name":"https://git.kernel.org/stable/c/41081202eb823f5b27ff164b12010b24428100ad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72478","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72478","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 425de2aba0d061b3e715d51a3b1992c112ed5b99 c69b9003332917b652175d5fa9d84158c5ed8617 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 8afc24a884aff6a6f08028bd779ee65c40054455 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e64f7dfcaff79e7dfff9121a382dd77f9b462f62 c23083b472a720c3f60b147db05b25b751c7c1bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d3012690a7065d9ca86521a525ad11e8af491d45 a31893206588374d7d16fad387189d8165c7efd3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.209 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0.4 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72478","cve":"CVE-2026-72478","epss":"0.001540000","percentile":"0.050640000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ntfs3/fslog.c","fs/ntfs3/ntfs_fs.h","fs/ntfs3/run.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c69b9003332917b652175d5fa9d84158c5ed8617","status":"affected","version":"425de2aba0d061b3e715d51a3b1992c112ed5b99","versionType":"git"},{"lessThan":"8afc24a884aff6a6f08028bd779ee65c40054455","status":"affected","version":"bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9","versionType":"git"},{"lessThan":"c23083b472a720c3f60b147db05b25b751c7c1bf","status":"affected","version":"e64f7dfcaff79e7dfff9121a382dd77f9b462f62","versionType":"git"},{"lessThan":"a31893206588374d7d16fad387189d8165c7efd3","status":"affected","version":"d3012690a7065d9ca86521a525ad11e8af491d45","versionType":"git"},{"lessThan":"41081202eb823f5b27ff164b12010b24428100ad","status":"affected","version":"b62567bca47408e6739dee75f02a2113548af875","versionType":"git"},{"lessThan":"bb11485a87fbb2254b62cfed630b699d50e57da8","status":"affected","version":"b62567bca47408e6739dee75f02a2113548af875","versionType":"git"},{"status":"affected","version":"bbad75336870b51b81979b97613746237fcb02fe","versionType":"git"},{"status":"affected","version":"41aadf5cb482793a24e05aa136224e179a778586","versionType":"git"},{"lessThan":"6.1.178","status":"affected","version":"6.1.175","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.140","versionType":"semver"},{"lessThan":"6.12.97","status":"affected","version":"6.12.86","versionType":"semver"},{"lessThan":"6.18.40","status":"affected","version":"6.18.27","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.209","versionType":"semver"},{"lessThan":"7.1","status":"affected","version":"7.0.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs3/fslog.c","fs/ntfs3/ntfs_fs.h","fs/ntfs3/run.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.175","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.140","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.12.86","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.18.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.209","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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"}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - mount(2)/get_tree_bdev on a crafted NTFS block device or loop image reaches ntfs_fill_super()→ntfs_loadlog_and_replay()→log_replay()→do_action(UpdateMappingPairs)→run_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->nres.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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:44:42.810Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"fs/ntfs3: add bounds check to run_get_highest_vcn()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","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","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:21","lastModifiedDate":"2026-08-17 06:19:15","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72478","Ordinal":"1","Title":"fs/ntfs3: add bounds check to run_get_highest_vcn()","CVE":"CVE-2026-72478","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72478","Ordinal":"1","NoteData":"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","Type":"Description","Title":"fs/ntfs3: add bounds check to run_get_highest_vcn()"}]}}}