---
id: CVE-2026-90399
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()

  Currently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the
  mac_phy_caps buffer as tot_phy_id * len, w…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()

  Currently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the
  mac_phy_caps buffer as tot_phy_id * len, w…
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 >= d889913205cf7ebda905b1e62c5867ed4e39f6c2 <
    d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b
  - >-
    Linux >= d889913205cf7ebda905b1e62c5867ed4e39f6c2 <
    b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a
  - >-
    Linux >= d889913205cf7ebda905b1e62c5867ed4e39f6c2 <
    26f8f87f0a556e7984366c64cebc16d49e15d22f
  - >-
    Linux >= d889913205cf7ebda905b1e62c5867ed4e39f6c2 <
    4c6eb712a91fa079be6f9f1419c96e0ad2227081
  - Linux 6.3
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:57.220'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90399'
references:
  - url: 'https://git.kernel.org/stable/c/26f8f87f0a556e7984366c64cebc16d49e15d22f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4c6eb712a91fa079be6f9f1419c96e0ad2227081'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90399.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90399'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536769'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90399'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90399'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90399.mbox
  - url: 'https://git.kernel.org/stable/c/79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00186
epssPercentile: 0.08081
ingestedAt: '2026-09-17T16:21:47.801Z'
cwe:
  - CWE-787
scores:
  nvd: 8.4
  vendor: 7
  cna: 8.4
---

## Overview

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

wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()

Currently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the
mac_phy_caps buffer as tot_phy_id * len, where len is clamped to
min(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). 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 ath12k_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.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90399.json)