CVE-2026-90399

/// Technical description

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

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References