---
cve: "CVE-2026-80945"
severity: "CRITICAL"
cvss: 9.1
epss: "47%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:00"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T17:15:05+02:00"
---

# CVE-2026-80945

> 9.1 CRITICAL

## Beschreibung

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

crypto: iaa - unmap dst before software fallback on decompress

On a hardware analytics error, decompress retries through the software
fallback, which writes req->dst with the CPU while it is still mapped
DMA_FROM_DEVICE. With SWIOTLB active the later dma_unmap_sg() copies the
stale bounce buffer over req->dst, corrupting the result.

Unmap before the fallback runs. The async path unmaps inline; the sync
path signals the retry with -EAGAIN so iaa_comp_adecompress() runs the
fallback after unmapping.

## CVSS-Vektor

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

| 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 | Keine | good |

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.51
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/fc933a4a419ba8a75da28666a018602c44846953>
- <https://git.kernel.org/stable/c/fcd86180ef78b0e41763faef7c6d2de7dfb50c1a>
- <https://git.kernel.org/stable/c/94a25930477113730372e0fa2985da4c5ac95c9a>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-80945) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_