# CVE-2026-90117: linux: In the Linux kernel, the following vulnerability has been resolved:  ntfs: validate usa_ofs before preserving the upd...

CVE-2026-90117 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90117 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-90117
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90117](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90117.md) | Sep 23, 2026 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.