{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72478", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.935Z", "datePublished": "2026-08-15T05:57:17.679Z", "dateUpdated": "2026-08-17T05:44:42.810Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:42.810Z" }, "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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c", "fs/ntfs3/ntfs_fs.h", "fs/ntfs3/run.c" ], "versions": [ { "version": "425de2aba0d061b3e715d51a3b1992c112ed5b99", "lessThan": "c69b9003332917b652175d5fa9d84158c5ed8617", "status": "affected", "versionType": "git" }, { "version": "bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9", "lessThan": "8afc24a884aff6a6f08028bd779ee65c40054455", "status": "affected", "versionType": "git" }, { "version": "e64f7dfcaff79e7dfff9121a382dd77f9b462f62", "lessThan": "c23083b472a720c3f60b147db05b25b751c7c1bf", "status": "affected", "versionType": "git" }, { "version": "d3012690a7065d9ca86521a525ad11e8af491d45", "lessThan": "a31893206588374d7d16fad387189d8165c7efd3", "status": "affected", "versionType": "git" }, { "version": "b62567bca47408e6739dee75f02a2113548af875", "lessThan": "41081202eb823f5b27ff164b12010b24428100ad", "status": "affected", "versionType": "git" }, { "version": "b62567bca47408e6739dee75f02a2113548af875", "lessThan": "bb11485a87fbb2254b62cfed630b699d50e57da8", "status": "affected", "versionType": "git" }, { "version": "bbad75336870b51b81979b97613746237fcb02fe", "status": "affected", "versionType": "git" }, { "version": "41aadf5cb482793a24e05aa136224e179a778586", "status": "affected", "versionType": "git" }, { "version": "6.1.175", "lessThan": "6.1.178", "status": "affected", "versionType": "semver" }, { "version": "6.6.140", "lessThan": "6.6.145", "status": "affected", "versionType": "semver" }, { "version": "6.12.86", "lessThan": "6.12.97", "status": "affected", "versionType": "semver" }, { "version": "6.18.27", "lessThan": "6.18.40", "status": "affected", "versionType": "semver" }, { "version": "5.15.209", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "7.0.4", "lessThan": "7.1", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c", "fs/ntfs3/ntfs_fs.h", "fs/ntfs3/run.c" ], "versions": [ { "version": "7.1", "status": "affected" }, { "version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.175", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.140", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.86", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.27", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2" }, { "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" } ] } ] } ], "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" } } } }