---
cve: "CVE-2026-45972"
severity: "CRITICAL"
cvss: 9.8
epss: "0.3%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-27 14:17:14"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-09T05:40:00+01:00"
---

# CVE-2026-45972

> 9.8 CRITICAL

## Beschreibung

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

smb: client: fix potential UAF and double free in smb2_open_file()

Zero out @err_iov and @err_buftype before retrying SMB2_open() to
prevent an UAF bug if @data != NULL, otherwise a double free.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Linux**
- State: PUBLISHED
- Stand: 2026-10-19 19:26:40
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## 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 |

## Schwachstellen-Klasse

- **CWE-416** — Use After Free
  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
- **CWE-825** — Expired Pointer Dereference
  The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.165
- Kernel ≥ 6.6.128
- Kernel ≥ 6.12.75
- Kernel ≥ 6.18.14
- Kernel ≥ 6.19.4

## BSI-Hinweise (deutsch)

- [Linux Kernel: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1700) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen oder andere nicht näher spezifizierte Auswirkungen zu erzielen.

## Referenzen

- <https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74>
- <https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151>
- <https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0>
- <https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73>
- <https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81>
- <https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda>
- <https://access.redhat.com/security/cve/CVE-2026-45972>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2481973>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-45972/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_