---
cve: "CVE-2026-25068"
severity: "MEDIUM"
cvss: 4.6
epss: "19%"
vendor: "ALSA Project"
kev: false
exploited: false
published: "2026-01-29 20:16:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T17:30:11+02:00"
---

# CVE-2026-25068

> 4.6 MEDIUM · 🧪 PoC

## Beschreibung

alsa-lib versions 1.2.2 up to and including 1.2.15.2, prior to commit 5f7fe33, contain a heap-based buffer overflow in the topology mixer control decoder. The tplg_decode_control_mixer1() function reads the num_channels field from untrusted .tplg data and uses it as a loop bound without validating it against the fixed-size channel array (SND_TPLG_MAX_CHAN). A crafted topology file with an excessive num_channels value can cause out-of-bounds heap writes, leading to a crash.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40 (Commit)

## Referenzen

- <https://github.com/alsa-project/alsa-lib/commit/5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40>
- <https://www.vulncheck.com/advisories/alsa-lib-topology-decoder-heap-based-buffer-overflow>
- <https://lists.debian.org/debian-lts-announce/2026/02/msg00008.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-25068) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_