# CVE-2026-98887: wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO

CVE-2026-98887 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-98887, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98887
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98887

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | bpftool ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-core ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-core ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-326.222.4.el9uek | [ELSA-2026-500574](https://patchblox.com/security/data/fix/linux/elsa-2026-500574.md) | Nov 7, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-98887](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98887.md) | Oct 24, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-98887](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98887.md) | Oct 24, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-98887](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98887.md) | Oct 24, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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