CVE-2026-98830 wifi: wfx: validate MIB read length before copying to caller
A buffer overflow in the Linux kernel wfx WiFi driver allows attackers to execute code or cause denial of service via malicious firmware responses.
- 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-2026-98830?
CVE-2026-98830 is a memory corruption vulnerability in Linux, published on 18 Oct 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: wfx: validate MIB read length before copying to caller
wfx_hif_read_mib() copies reply->length bytes from the firmware response into the caller-provided buffer without checking that reply->length does not exceed val_len. A firmware response with a length field larger than expected overruns the caller buffer and reads past the end of the reply allocation.
Replace the dead -ENOMEM check with an active validation that reply->length fits within val_len before the memcpy.
Which versions are affected by CVE-2026-98830?
How do I fix CVE-2026-98830?
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-2026-98830 being exploited?
There is no known exploitation of CVE-2026-98830 in the wild and no public exploit code.
Sources
Also known as AZL-108972, BELL-CVE-2026-98830, DEBIAN-CVE-2026-98830, GHSA-m222-4jcj-v2hx, UBUNTU-CVE-2026-98830.