CVE-2026-90117
UnknownSummary
In the Linux kernel, ntfs_mft_record_alloc() reads the old update sequence number from an unvalidated MFT record using the untrusted usa_ofs field. A corrupted record can place usa_ofs past the end of the record, causing a two-byte read outside the folio and a use-after-free.
Risk Assessment
A use-after-free when creating a file on a corrupted NTFS filesystem may lead to a kernel crash or potential privilege escalation.
Recommendation
Update the Linux kernel to a version with the fix that only preserves the old update sequence number when usa_ofs is even and in range.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ntfs: validate usa_ofs before preserving the update sequence number When ntfs_mft_record_alloc() reuses a free mft record it reads the old update sequence number straight from the on-disk record: usn = *(__le16 *)((u8 *)m + le16_to_cpu(m->usa_ofs)); Here m points into the raw $MFT page-cache folio, which still holds unvalidated, MST-protected bytes: the folio is read by a plain iomap_read_folio() and neither post_read_mst_fixup() nor ntfs_mft_record_check() has run on it (both work on private copies). m->usa_ofs is therefore an untrusted u16, and a corrupted record can put it past the end of the record so the two-byte read lands outside the folio. Reading such a record while creating a file gives, under KASAN: BUG: KASAN: use-after-free in ntfs_mft_record_alloc+... Read of size 2 at addr ... ntfs_mft_record_alloc -> __ntfs_create -> ntfs_create -> path_openat Only preserve the old update sequence number when usa_ofs is even and in range, mirroring the check ntfs_mft_record_check() already applies; otherwise leave usn zero, which the existing restore below skips.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS