CVE-2025-71100: wifi: rtlwifi: 8192cu: fix tid out of range in rtl92cu_tx_fill_desc()

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: 2026-01-13 · updated 2026-10-19
Weakness: CWE-129

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: 8192cu: fix tid out of range in rtl92cu_tx_fill_desc() TID getting from ieee80211_get_tid() might be out of range of array size of sta_entry->tids[], so check TID is less than MAX_TID_COUNT. Othwerwise, UBSAN warn: UBSAN: array-index-out-of-bounds in drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:514:30 index 10 is out of range for type 'rtl_tid_data [9]'

Affected products

Linux kernel: from 6.9.1 before 6.12.64; from 6.13 before 6.18.4; 6.9, 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5 (+3) — fixed in 6.12.64, 6.18.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.64, 6.18.4. Check the vendor advisory for mitigations.

References

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