CVE-2026-64255

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1de92789ce31e46fa7e7d8e89c90b19cdb1c103baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfcaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f056fc2b927448d37eca6b6cacc3d1b0f67b20d2affected
LinuxLinux0 < 6.18.38affected
LinuxLinux0 < 7.1.3affected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References