CVE-2025-68362

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.

Is your site exposed to CVE-2025-68362?

Run a free security scan — no signup, results in seconds.

References

Other References

https://git.kernel.org/stable/c/118e12bf3e4288cf845cd3759bd9d4c99f91aab5 https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355 https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15 https://git.kernel.org/stable/c/638d4148e166d114a4cd7becaae992ce1a815ed8 https://git.kernel.org/stable/c/6a96bd0d94305fd04a6ac64446ec113bae289384 https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840 https://git.kernel.org/stable/c/dc153401fb26c1640a2b279c47b65e1c416af276 https://git.kernel.org/stable/c/e2f3ea15e804607e0a4a34a2f6c331c8750b68bc

Frequently Asked Questions

What is CVE-2025-68362? +

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.

How do I check if I'm vulnerable to CVE-2025-68362? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2025-68362

Description

References

Other References

Frequently Asked Questions

Don't wait for an exploit