CVE-2026-98422
Received
Received - Intake
Wi-Fi AP_VLAN Tailroom Counter Reset on ifdown in Linux Kernel
Vulnerability report for CVE-2026-98422, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown
On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from
the AP interface, but it's never decremented again unless the AP is
also brought down. Thus, bringing the same AP_VLAN up again will
increment the counter again and eventually hit the sanity check:
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
master->crypto_tx_tailroom_needed_cnt);
Reset it on ifdown to avoid that.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 |
| Linux | Linux | 4.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
