CVE-2025-71100 wifi: rtlwifi: 8192cu: fix tid out of range in rtl92cu_tx_fill_desc()
An out-of-bounds array index in the Realtek 8192cu WiFi driver can cause a kernel crash, requiring a patch to validate TID values.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-71100?
CVE-2025-71100 is a high-severity vulnerability in Linux kernel, published on 13 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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]'
Which versions are affected by CVE-2025-71100?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71100?
Apply the vendor's patch.
Is CVE-2025-71100 being exploited?
There is no known exploitation of CVE-2025-71100 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-71100, DEBIAN-CVE-2025-71100, GHSA-2jh5-q7j2-v3r6, ROOT-OS-DEBIAN-13-CVE-2025-71100, UBUNTU-CVE-2025-71100.