{"id":"CVE-2026-72478","title":"fs/ntfs3: add bounds check to run_get_highest_vcn()","summary":"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 …","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 425de2aba0d061b3e715d51a3b1992c112ed5b99 < c69b9003332917b652175d5fa9d84158c5ed8617","Linux >= bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 < 8afc24a884aff6a6f08028bd779ee65c40054455","Linux >= e64f7dfcaff79e7dfff9121a382dd77f9b462f62 < c23083b472a720c3f60b147db05b25b751c7c1bf","Linux >= d3012690a7065d9ca86521a525ad11e8af491d45 < a31893206588374d7d16fad387189d8165c7efd3","Linux >= b62567bca47408e6739dee75f02a2113548af875 < 41081202eb823f5b27ff164b12010b24428100ad","Linux >= b62567bca47408e6739dee75f02a2113548af875 < bb11485a87fbb2254b62cfed630b699d50e57da8","Linux bbad75336870b51b81979b97613746237fcb02fe","Linux 41aadf5cb482793a24e05aa136224e179a778586","Linux >= 6.1.175 < 6.1.178","Linux >= 6.6.140 < 6.6.145","Linux >= 6.12.86 < 6.12.97","Linux >= 6.18.27 < 6.18.40","Linux >= 5.15.209 < 5.16","Linux >= 7.0.4 < 7.1","Linux 7.1"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:50:38.730753Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:26.034Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72478","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"}],"tags":["cve.org"],"epss":0.00196,"epssPercentile":0.08646,"ingestedAt":"2026-10-16T19:46:24.392Z","slug":"CVE-2026-72478","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 425de2aba0d061b3e715d51a3b1992c112ed5b99 < c69b9003332917b652175d5fa9d84158c5ed8617`\n- `Linux >= bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 < 8afc24a884aff6a6f08028bd779ee65c40054455`\n- `Linux >= e64f7dfcaff79e7dfff9121a382dd77f9b462f62 < c23083b472a720c3f60b147db05b25b751c7c1bf`\n- `Linux >= d3012690a7065d9ca86521a525ad11e8af491d45 < a31893206588374d7d16fad387189d8165c7efd3`\n- `Linux >= b62567bca47408e6739dee75f02a2113548af875 < 41081202eb823f5b27ff164b12010b24428100ad`\n- `Linux >= b62567bca47408e6739dee75f02a2113548af875 < bb11485a87fbb2254b62cfed630b699d50e57da8`\n- `Linux bbad75336870b51b81979b97613746237fcb02fe`\n- `Linux 41aadf5cb482793a24e05aa136224e179a778586`\n- `Linux >= 6.1.175 < 6.1.178`\n- `Linux >= 6.6.140 < 6.6.145`\n- `Linux >= 6.12.86 < 6.12.97`\n- `Linux >= 6.18.27 < 6.18.40`\n- `Linux >= 5.15.209 < 5.16`\n- `Linux >= 7.0.4 < 7.1`\n- `Linux 7.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}