---
cve: "CVE-2025-21734"
severity: "HIGH"
cvss: 7.8
epss: "20%"
vendor: "Linux"
kev: false
exploited: false
published: "2025-02-27 03:15:14"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T14:44:04+02:00"
---

# CVE-2025-21734

> 7.8 HIGH

## Beschreibung

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

misc: fastrpc: Fix copy buffer page size

For non-registered buffer, fastrpc driver copies the buffer and
pass it to the remote subsystem. There is a problem with current
implementation of page size calculation which is not considering
the offset in the calculation. This might lead to passing of
improper and out-of-bounds page size which could result in
memory issue. Calculate page start and page end using the offset
adjusted address instead of absolute address.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.129
- Kernel ≥ 6.6.78
- Kernel ≥ 6.12.14
- Kernel ≥ 6.13.3

## Referenzen

- <https://git.kernel.org/stable/c/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623>
- <https://git.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55>
- <https://git.kernel.org/stable/c/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51>
- <https://git.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4>
- <https://git.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66>
- <https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-21734) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_