wifi: mac80211: avoid out-of-bounds read for empty PREQ elements

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: avoid out-of-bounds read for empty PREQ elements ieee80211_mesh_preq_size_ok() derives the location of the PREQ bottom fields before checking whether the element contains even the fixed header. ieee80211_mesh_hwmp_preq_get_bottom() reads the flags byte to account for the optional Address Extension field. Consequently, an empty PREQ element causes a one-byte read beyond its declared payload. Move the helper call after both size checks, so the bottom fields are only accessed when they are present.

Source published

6 Oct 2026 08:44:26 UTC

Source modified

19 Oct 2026 09:15:14 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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