CVE-2026-90399

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, 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

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd889913205cf7ebda905b1e62c5867ed4e39f6c2 < d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8baffected
LinuxLinuxd889913205cf7ebda905b1e62c5867ed4e39f6c2 < b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0aaffected
LinuxLinuxd889913205cf7ebda905b1e62c5867ed4e39f6c2 < 26f8f87f0a556e7984366c64cebc16d49e15d22faffected
LinuxLinuxd889913205cf7ebda905b1e62c5867ed4e39f6c2 < 4c6eb712a91fa079be6f9f1419c96e0ad2227081affected
LinuxLinux6.3affected
LinuxLinux0 < 6.3unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References