CVE-2026-72478High· 8.4▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 46.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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
Linux >= 425de2aba0d061b3e715d51a3b1992c112ed5b99 < c69b9003332917b652175d5fa9d84158c5ed8617Linux >= bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 < 8afc24a884aff6a6f08028bd779ee65c40054455Linux >= e64f7dfcaff79e7dfff9121a382dd77f9b462f62 < c23083b472a720c3f60b147db05b25b751c7c1bfLinux >= d3012690a7065d9ca86521a525ad11e8af491d45 < a31893206588374d7d16fad387189d8165c7efd3Linux >= b62567bca47408e6739dee75f02a2113548af875 < 41081202eb823f5b27ff164b12010b24428100adLinux >= b62567bca47408e6739dee75f02a2113548af875 < bb11485a87fbb2254b62cfed630b699d50e57da8Linux bbad75336870b51b81979b97613746237fcb02feLinux 41aadf5cb482793a24e05aa136224e179a778586Linux >= 6.1.175 < 6.1.178Linux >= 6.6.140 < 6.6.145Linux >= 6.12.86 < 6.12.97Linux >= 6.18.27 < 6.18.40Linux >= 5.15.209 < 5.16Linux >= 7.0.4 < 7.1Linux 7.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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