---
cve: "CVE-2026-97957"
severity: "HIGH"
cvss: 8.8
epss: "0.1%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-25 11:17:23"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T21:51:56+02:00"
---

# CVE-2026-97957

> 8.8 HIGH

## Beschreibung

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

net: hinic: fix mailbox segment buffer overflow

check_mbox_seq_id_and_seg_len() validates that seq_id does not
exceed SEQ_ID_MAX_VAL (42) and seg_len does not exceed
MBOX_SEG_LEN (48).  However, this allows the last segment
(seq_id=42) to carry a full 48-byte payload, writing to offset
42*48=2016 for 48 bytes (ending at byte 2064).  The receive
buffer is only MBOX_MAX_BUF_SZ (2048) bytes, resulting in a
16-byte heap buffer overflow.

The hinic3 driver already handles this correctly by defining
MBOX_LAST_SEG_MAX_LEN and rejecting the last segment when it
exceeds the remaining buffer space.  Apply the same fix to the
hinic driver.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.111
- Kernel ≥ 6.18.53
- Kernel ≥ 7.2.7

## BSI-Hinweise (deutsch)

- [Linux Kernel: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3579) — _BSI-Einstufung: mittel_
  Ein lokaler Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Zustand herbeizuführen oder nicht näher spezifizierten Angriff durchzuführen.

## Referenzen

- <https://git.kernel.org/stable/c/7cc974799fde846eda2d8f00ad4f8e1810eb0499>
- <https://git.kernel.org/stable/c/8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920>
- <https://git.kernel.org/stable/c/72be1fd5d256dde748c0905c5e1749a119cad5bd>
- <https://git.kernel.org/stable/c/c622bbc212207d7c6bbd69dd88f0c3a3f5853d16>
- <https://git.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674>
- <https://git.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5>
- <https://git.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096f>
- <https://git.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-97957) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_