CVE-2025-68362 wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()
A buffer underflow in the rtl8187 WiFi driver allows attackers to cause a kernel panic via truncated packets, requiring a patch.
- 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-2025-68362?
CVE-2025-68362 is a memory corruption vulnerability in Linux, published on 24 Dec 2025. 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: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()
The rtl8187_rx_cb() calculates the rx descriptor header address by subtracting its size from the skb tail pointer. However, it does not validate if the received packet (skb->len from urb->actual_length) is large enough to contain this header.
If a truncated packet is received, this will lead to a buffer underflow, reading memory before the start of the skb data area, and causing a kernel panic.
Add length checks for both rtl8187 and rtl8187b descriptor headers before attempting to access them, dropping the packet cleanly if the check fails.
Which versions are affected by CVE-2025-68362?
How do I fix CVE-2025-68362?
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-2025-68362 being exploited?
There is no known exploitation of CVE-2025-68362 in the wild and no public exploit code.
Sources
Also known as AZL-73063, BELL-CVE-2025-68362, DEBIAN-CVE-2025-68362, GHSA-x793-gh9g-39hm, ROOT-OS-DEBIAN-11-CVE-2025-68362, ROOT-OS-DEBIAN-12-CVE-2025-68362 and 4 more.