---
id: CVE-2026-90398
title: |-
  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 * le…
summary: |-
  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 * le…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5b90fc760db5a969ed26d70f8e62c91915f012bd <
    bbb3b3334a9ed850c5b332eedea107796e691237
  - >-
    Linux >= 5b90fc760db5a969ed26d70f8e62c91915f012bd <
    75185e2b214e842b7e0af29e5d1fef155662b8b1
  - >-
    Linux >= 5b90fc760db5a969ed26d70f8e62c91915f012bd <
    acff2713c3212ade15051e7b421f15c89927e70f
  - >-
    Linux >= 5b90fc760db5a969ed26d70f8e62c91915f012bd <
    7a246c72132eb943b5844ba79dad597b47429dba
  - Linux 5.6
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:57.090'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90398'
references:
  - url: 'https://git.kernel.org/stable/c/75185e2b214e842b7e0af29e5d1fef155662b8b1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7a246c72132eb943b5844ba79dad597b47429dba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/acff2713c3212ade15051e7b421f15c89927e70f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bbb3b3334a9ed850c5b332eedea107796e691237'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00196
epssPercentile: 0.08246
ingestedAt: '2026-09-17T16:21:47.801Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.