---
cve: "CVE-2026-90398"
severity: "HIGH"
cvss: 8.4
epss: "0.1%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-17 17:17:39"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T08:13:17+02:00"
---

# CVE-2026-90398

> 8.4 HIGH

## Beschreibung

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

wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()

Currently, in ath11k_wmi_tlv_mac_phy_caps_parse(), kcalloc() sizes the
mac_phy_caps buffer as tot_phy_id * len, where len is clamped to
min(firmware_len, sizeof(struct wmi_mac_phy_capabilities)). The subsequent
memcpy() destination advances by sizeof(full struct) per slot via C
pointer arithmetic, not by the clamped len. When firmware sends short
TLVs, the second and later slots are written past the end of the
allocation.

The reader in ath11k_pull_mac_phy_cap_svc_ready_ext() also indexes the
buffer with full-struct pointer arithmetic, so the allocation must match
that stride.

Fix by using kzalloc_objs(), which derives the element size from the
pointer type, making allocation size and pointer stride provably
consistent regardless of what len the firmware provides.

Compile tested only.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| 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 ≥ 6.12.110
- Kernel ≥ 6.18.52
- Kernel ≥ 7.2.6

## Referenzen

- <https://git.kernel.org/stable/c/bbb3b3334a9ed850c5b332eedea107796e691237>
- <https://git.kernel.org/stable/c/75185e2b214e842b7e0af29e5d1fef155662b8b1>
- <https://git.kernel.org/stable/c/acff2713c3212ade15051e7b421f15c89927e70f>
- <https://git.kernel.org/stable/c/7a246c72132eb943b5844ba79dad597b47429dba>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-90398) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_