---
cve: "CVE-2026-72098"
severity: "CRITICAL"
cvss: 9.8
epss: "65%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-15 06:21:23"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T06:55:13+02:00"
---

# CVE-2026-72098

> 9.8 CRITICAL

## Beschreibung

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

dm-verity: fix buffer overflow in FEC calculation

There's a buffer overflow in dm-verity-fec:

if (neras && *neras fec->roots)
	fio->erasures[(*neras)++] = i;

This allows *neras to reach roots + 1 (the post-increment pushes it past
roots). This value is then passed as no_eras to decode_rs8(). Inside the
RS decoder (lib/reed_solomon/decode_rs.c:113-121), the erasure locator
polynomial loop writes lambda[j] where j can reach nroots + 1 — one
element past the end of lambda[] (which is sized nroots + 1, valid
indices 0..nroots). The out-of-bounds write lands on syn[0], corrupting
the syndrome buffer.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| 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 ≥ 6.18.42
- Kernel ≥ 7.1.5

## Referenzen

- <https://git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66>
- <https://git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7>
- <https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72098) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_