fs/ntfs3: add bounds check to run_get_highest_vcn()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72478
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:21 UTC
Updated2026-08-17 06:19:15 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001540000 probability, percentile 0.050640000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 425de2aba0d061b3e715d51a3b1992c112ed5b99 c69b9003332917b652175d5fa9d84158c5ed8617 git Not specified
CNA Linux Linux affected bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 8afc24a884aff6a6f08028bd779ee65c40054455 git Not specified
CNA Linux Linux affected e64f7dfcaff79e7dfff9121a382dd77f9b462f62 c23083b472a720c3f60b147db05b25b751c7c1bf git Not specified
CNA Linux Linux affected d3012690a7065d9ca86521a525ad11e8af491d45 a31893206588374d7d16fad387189d8165c7efd3 git Not specified
CNA Linux Linux affected b62567bca47408e6739dee75f02a2113548af875 41081202eb823f5b27ff164b12010b24428100ad git Not specified
CNA Linux Linux affected b62567bca47408e6739dee75f02a2113548af875 bb11485a87fbb2254b62cfed630b699d50e57da8 git Not specified
CNA Linux Linux affected bbad75336870b51b81979b97613746237fcb02fe git Not specified
CNA Linux Linux affected 41aadf5cb482793a24e05aa136224e179a778586 git Not specified
CNA Linux Linux affected 6.1.175 6.1.178 semver Not specified
CNA Linux Linux affected 6.6.140 6.6.145 semver Not specified
CNA Linux Linux affected 6.12.86 6.12.97 semver Not specified
CNA Linux Linux affected 6.18.27 6.18.40 semver Not specified
CNA Linux Linux affected 5.15.209 5.16 semver Not specified
CNA Linux Linux affected 7.0.4 7.1 semver Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c69b9003332917b652175d5fa9d84158c5ed8617 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a31893206588374d7d16fad387189d8165c7efd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c23083b472a720c3f60b147db05b25b751c7c1bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8afc24a884aff6a6f08028bd779ee65c40054455 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bb11485a87fbb2254b62cfed630b699d50e57da8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41081202eb823f5b27ff164b12010b24428100ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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