CVE-2026-64443 staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop
A malicious access point can trigger an out-of-bounds read in the rtl8723bs Wi-Fi driver, potentially leaking memory or causing a system crash.
- 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-2026-64443?
CVE-2026-64443 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jul 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:
staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop
The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer.
Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions.
Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len.
Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length for consistency with the sizeof(*pIE) guards added above.
Weakness: CWE-125
Which versions are affected by CVE-2026-64443?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64443?
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-2026-64443 being exploited?
There is no known exploitation of CVE-2026-64443 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93596, BELL-CVE-2026-64443, DEBIAN-CVE-2026-64443, GHSA-cffr-qfxf-qjr4, ROOT-OS-DEBIAN-12-CVE-2026-64443, ROOT-OS-UBUNTU-2204-CVE-2026-64443 and 1 more.