---
cve: "CVE-2026-89615"
severity: "HIGH"
cvss: 8.4
epss: "15%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:46"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T03:21:45+02:00"
---

# CVE-2026-89615

> 8.4 HIGH

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: bound page_lcns[] index by the log record

The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i,
where i runs up to the log record's lcns_follow. That count is checked only
against the record's own length, not the target entry, so check_dp_table()
(which validates the entry's lcns_follow) does not cover it: the copy_lcns
entry may even be freshly allocated after that check, and find_dp() bounds j
but not i. A crafted record thus overflows page_lcns[] of an otherwise valid
entry.

Add dp_range_ok() and reject, before each loop, any record whose run does
not fit the entry. These are the only two page_lcns[] accesses indexed by
the record rather than the entry, so together with the entry validation
every access is now bounded.

[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.15.221
- Kernel ≥ 6.1.188
- Kernel ≥ 6.6.157
- Kernel ≥ 6.12.109
- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3>
- <https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca>
- <https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b>
- <https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6>
- <https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f>
- <https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c>
- <https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89615) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_