CVE-2026-98890 wifi: libertas: reject short monitor TX frames

Not scored Published 23 Oct 2026 Updated 26 Oct 2026

Exploited in the wild: Not known
Fix: Available

What is CVE-2026-98890?

CVE-2026-98890 is a vulnerability in Linux, published on 23 Oct 2026.

Official description

In the Linux kernel, the following vulnerability has been resolved:

wifi: libertas: reject short monitor TX frames

In monitor mode, lbs_hard_start_xmit() casts skb->data to a radiotap TX header, skips that header, and then copies the 802.11 destination address from offset 4 in the remaining frame. The generic length check only rejects zero-length and oversized skbs, so a short monitor frame can be read past the end of the skb data.

Require enough bytes for the radiotap TX header and the destination address field before using the monitor-mode header layout.

Which versions are affected by CVE-2026-98890?

How do I fix CVE-2026-98890?

Upgrade to a fixed version.

Is CVE-2026-98890 being exploited?

There is no known exploitation of CVE-2026-98890 in the wild and no public exploit code.

Sources

Also known as AZL-110635, BELL-CVE-2026-98890, DEBIAN-CVE-2026-98890, GHSA-65v2-4hr3-h5j6, UBUNTU-CVE-2026-98890.