CVE-2026-98140: ntfs: fix kmap_local leak in write_mft_record_nolock() error paths

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-25 · updated 2026-10-26
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: fix kmap_local leak in write_mft_record_nolock() error paths write_mft_record_nolock() maps the MFT record folio with kmap_local_folio(), but the pre_write_mst_fixup() and bio_add_folio() failure paths jump to the error label without unmapping it. kmap_local mappings are stack-ordered per task, so leaking one corrupts the nesting for any outer mapping. Unmap the folio on those error paths too.

Affected products

Linux kernel: from 7.1 before 7.2.7; 7.3-rc1 — fixed in 7.2.7
Linux kernel: 7.1 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.2.7; Linux kernel 7.3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-98140 or the next vulnerability affects your stack