---
cve: "CVE-2026-72310"
severity: "HIGH"
cvss: 8.1
epss: "64%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-15 06:22:03"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T12:21:07+02:00"
---

# CVE-2026-72310

> 8.1 HIGH

## Beschreibung

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

smb: client: fix overflow in passthrough ioctl bounds check

smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload
before copying it to userspace.

The payload offset and length both come from 32-bit fields. The bounds
check currently adds OutputOffset and qi.input_buffer_length directly, so
the addition can wrap in 32-bit arithmetic before the result is compared
against the response buffer length.

A malicious server can use a large OutputOffset and a small OutputCount
to make the wrapped sum pass the bounds check. The later copy_to_user()
then reads from io_rsp + OutputOffset, outside the response buffer.

Use size_add() for the offset plus length check so overflow is treated as
out of bounds.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.261
- Kernel ≥ 5.15.212
- Kernel ≥ 6.1.178
- Kernel ≥ 6.6.145
- Kernel ≥ 6.12.97
- Kernel ≥ 6.18.40
- Kernel ≥ 7.1.5

## Referenzen

- <https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa>
- <https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f>
- <https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974>
- <https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a>
- <https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670>
- <https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67>
- <https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9>
- <https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72310) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_