---
cve: "CVE-2026-98323"
severity: "CRITICAL"
cvss: 9.8
epss: "0.6%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-10-06 09:18:24"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T14:23:47+02:00"
---

# CVE-2026-98323

> 9.8 CRITICAL

## Beschreibung

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

RDMA/siw: Bound fragmented header copies by the remaining length

siw_get_hdr() can receive an extended DDP/RDMAP header across more than
one TCP callback. The first callback may receive most of the header,
while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead
of the number of missing bytes. This makes the destination move past the
end of the header and overwrite the receive state, including
fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd
value as a copy offset, which creates an OOB write.

Use the number of header bytes already received when calculating the
next copy length.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Linux**
- State: PUBLISHED
- Stand: 2026-10-19 09:17:33
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## 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 ≥ 5.10.271
- Kernel ≥ 5.15.222
- Kernel ≥ 6.1.189
- Kernel ≥ 6.6.158
- Kernel ≥ 6.12.112
- Kernel ≥ 6.18.54
- Kernel ≥ 7.2.8

## BSI-Hinweise (deutsch)

- [Linux Kernel: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3743) — _BSI-Einstufung: mittel_
  Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, möglicherweise einen Denial-of-Service-Angriff auszulösen, Daten zu manipulieren oder offenzulegen oder Sicherheitsmaßnahmen zu umgehen.

## Referenzen

- <https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7>
- <https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48>
- <https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e>
- <https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c>
- <https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742>
- <https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f>
- <https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d>
- <https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-98323/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_