---
cve: "CVE-2026-64387"
severity: "CRITICAL"
cvss: 9.8
epss: "46%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-25 10:17:22"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T12:57:15+02:00"
---

# CVE-2026-64387

> 9.8 CRITICAL

## Beschreibung

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

smb: client: fix query directory replay double-free

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_query_directory_init() fails before the next send,
cleanup retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.

## 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 ≥ 6.6.145
- Kernel ≥ 6.12.96
- Kernel ≥ 6.18.39
- Kernel ≥ 7.1.4

## Referenzen

- <https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98>
- <https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994>
- <https://git.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336>
- <https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde>
- <https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-64387) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_