CVE-2026-64255 – wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers

CVE ID :CVE-2026-64255

Published : July 24, 2026, 3:31 p.m. | 19 minutes ago

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

wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers

Three BA session handlers use ffs(ba_data->sta_mask) – 1 to derive a
station ID without checking that sta_mask is non-zero. When sta_mask is
zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing
an out-of-bounds access on fw_id_to_link_sta[].

Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call,
consistent with the existing check in iwl_mld_ampdu_rx_start().

Severity: 0.0 | NA

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