CVE-2026-93802 wifi: rsi: validate beacon length before fixed buffer copy
A buffer overflow in the Linux kernel RSI WiFi driver allows attackers to cause denial of service or execute code via crafted beacon frames.
- 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-2026-93802?
CVE-2026-93802 is a memory corruption vulnerability in Linux, published on 24 Sep 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: rsi: validate beacon length before fixed buffer copy
rsi_prepare_beacon() copies the mac80211 beacon frame after FRAME_DESC_SZ into a management skb whose usable tailroom may be smaller than MAX_MGMT_PKT_SIZE after alignment.
Validate the beacon length against the actual tailroom before the copy and skb_put(). Leave ownership of the management skb with the caller on error, matching the existing rsi_send_beacon() cleanup path.
Which versions are affected by CVE-2026-93802?
How do I fix CVE-2026-93802?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-93802 being exploited?
There is no known exploitation of CVE-2026-93802 in the wild and no public exploit code.
Sources
Also known as AZL-103751, BELL-CVE-2026-93802, DEBIAN-CVE-2026-93802, GHSA-5x9j-5x5g-gr56, UBUNTU-CVE-2026-93802.