CVE-2026-90399

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