CVE-2025-71234: wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-18 · updated 2026-10-19
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add The driver does not set hw->sta_data_size, which causes mac80211 to allocate insufficient space for driver private station data in __sta_info_alloc(). When rtl8xxxu_sta_add() accesses members of struct rtl8xxxu_sta_info through sta->drv_priv, this results in a slab-out-of-bounds write. KASAN report on RISC-V (VisionFive 2) with RTL8192EU adapter: BUG: KASAN: slab-out-of-bounds in rtl8xxxu_sta_add+0x31c/0x346 Write of size 8 at addr ffffffd6d3e9ae88 by task kworker/u16:0/12 Set hw->sta_data_size to sizeof(struct rtl8xxxu_sta_info) during probe, similar to how hw->vif_data_size is configured. This ensures mac80211 allocates sufficient space for the driver's per-station private data. Tested on StarFive VisionFive 2 v1.2A board.

Affected products

Linux kernel: from 6.9 before 6.12.72; from 6.13 before 6.18.11; from 6.19 before 6.19.1 — fixed in 6.12.72, 6.18.11, 6.19.1

How to fix

Upgrade to a fixed version: Linux kernel 6.12.72, 6.18.11, 6.19.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-71234 or the next vulnerability affects your stack