---
cve: "CVE-2026-74646"
severity: "HIGH"
cvss: 7.8
epss: "25.8%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-22 16:16:37"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:26:16+02:00"
---

# CVE-2026-74646

> 7.8 HIGH

## Beschreibung

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

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

When an invoke is interrupted by a signal,
wait_for_completion_interruptible() returns -ERESTARTSYS and
fastrpc_internal_invoke() moves every buffer from fl->mmaps onto
cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk
runs without holding fl->lock, the lock that serialises fl->mmaps in
fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.

Take fl->lock around the move, matching every other fl->mmaps accessor.

## 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 ≥ 6.6.152
- Kernel ≥ 6.12.104
- Kernel ≥ 6.18.45
- Kernel ≥ 7.1.9

## Referenzen

- <https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724>
- <https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a>
- <https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369>
- <https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2>
- <https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74646) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_