What’s Vulnerable › Vulnerabilities

CVE-2025-68362: wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()

• Severity: unknown
• 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: 2025-12-24 · updated 2026-10-13

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.

Affected products

• Linux kernel: 2.6.27 — fixed in 6.19

How to fix

Upgrade to a fixed version: Linux kernel 6.19. Check the vendor advisory for mitigations.

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

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